How much do babies eat at 3 weeks


A newborn baby eats an average of eight to 12 times a day during the first three weeks of life. This is somewhat overwhelming for both parents and baby as the newborn must learn how to nurse or take a bottle, and the mother must learn how to feed her baby in a way that benefits both her own health and her baby’s growth and development. This article provides information on how much babies eat at 3 weeks.

At 3 weeks old, babies consume between 25 and 35 ounces of breastmilk or formula per day. Breastfed babies nurse 20-45 minutes at a time while formula fed babies are usually fed 8-12 ounces every 2-4 hours. In the first few days after birth, a baby may need up to 3 ounces at each feeding then gradually builds up his appetite so that by 4-5 weeks he will be consuming 6-8 ounces of formula or breastmilk at each feeding session.

At 3 weeks, most babies will be sleeping for longer periods between feedings, usually about 4 hours during the night but with shorter naps during the day until they reach 6-8 weeks old when they become more settled into their own routine.

General Guidelines for Feeding Babies

When it comes to feeding babies, there are some general guidelines that you should follow. It is important to understand the nutritional needs of a baby, the amount they should eat at different stages of their development, and the proper technique for feeding them. This article will provide an overview of the general guidelines for feeding babies and how much they should be eating at three weeks of development.

Frequency of Feedings

At three weeks old, your baby will generally eat every two to three hours during the day and night. The American Academy of Pediatrics recommends that babies be fed on demand – when they show signs of hunger, such as increased alertness or movement of their arms and legs. Newborns should not go more than four hours without eating.

It is important to recognize your baby’s cues for hunger, such as rooting or sucking motions, after a period of sleep. As your little one continues to grow, feedings may happen more often or last longer as she begins to need more nourishment. Generally speaking though, at three weeks of age, your baby will need about four ounces per feeding on average during the day and five ounces per feeding during the night.

Feedings can often take anywhere from 20 minutes to an hour – preferably as long as it takes for your little one to nurse until he is satisfied – so be sure to set aside enough time available throughout the day and night for frequent feedings. It’s okay if he falls asleep while nursing; this happens often in the first few months and means that he has had enough milk and is ready to be burped before going back in his crib for a nap!

Amount of Feedings

At four weeks of age, your baby still needs to eat about every three to four hours. Breastmilk provides the ideal nutrition for babies and some theorize that certain proteins in breastmilk help the baby’s growing brain cells thrive. Whether you are feeding your baby formula or exclusive breastmilk, it’s important to remember that a baby will usually feed differently every day.

When calculating how much a baby should eat, it is best to feed according to hunger cues. The most important thing is to make sure your baby’s caloric needs are met no matter which type of milk you choose. The following information will provide some general guidelines for feeding a 3-week-old infant:

  • Amount of Feedings: A typical 3-week-old infant should feed around 8 – 12 times per day, approximately every 2-3 hours during the day and night. The exact amount may vary depending on your individual child’s needs and preferences.
  • Length of Feedings: During feeds, offer your baby as much or as little milk as she wants and allow her to take frequent breaks throughout the feeding time if needed rather than have her eat an entire bottle in one sitting. If offering formula, aim for 2 – 4 ounces per meal but remember that all babies are different; let their hunger guide them when determining how much milk they need at each sitting. If breastfeeding, use breastfeeding time as an opportunity for closeness rather than focus on predetermined amounts of milk. Generally speaking most babies can take anywhere from 10 – 30 minutes per side during a breastfeeding session but again this may vary depending on individual circumstances; follow your child’s cues regarding nursing duration and frequency!

Feeding a 3-Week-Old Baby

Feeding a 3-week-old baby for the first time can be a daunting task for new parents. While babies have different needs at this stage, the general rule of thumb is that a newborn should be fed every 2-3 hours. This means that a 3-week-old baby should be fed at least 8 times in 24 hours.

It is important to know what type of milk a 3-week-old needs, how much milk is needed, and other considerations when feeding a newborn at this age.


Breastfeeding is recommended as the best way to feed a newborn and is the best source of nutrition for babies up to around six months of age. When breastfed, 3-week-old babies should be fed every two to three hours, and usually take around three ounces per feeding. Breastfed babies may also need to feed more often, as many times as eight or nine times in 24 hours. It’s important for nursing mothers to watch for hunger signs and feed their babes before they get too hungry or become too sleepy for a feeding.

To ensure the baby is getting enough milk, it’s advised that nursing moms listen for swallows during breastfeeding and not rely on time alone. Signs that your 3-week-old infant is getting enough milk include:

  • plenty of wet diapers (at least five by day six)
  • frequent bowel movements

Newborns who do not receive sufficient nutrition can become dehydrated quickly, so it’s important to check with your pediatrician if you suspect your baby isn’t getting enough nourishment during breastfeeding sessions.

Formula Feeding

If you are feeding your 3-week-old baby formula, it is important to understand the basics of what and how much formula your baby should be consuming. Generally speaking, most 3-week-old babies will consume 2 to 3 ounces of formula after every feedings. This amount can vary depending on the age and size of the baby as well as the brand and type of formula used.

When introducing a bottle for the first time, it is important to start with short feeds in order for your baby to get used to and become comfortable with the bottle nipple. Over time, you can begin increasing feeding times in order to meet your baby’s needs.

It is also very important to pay attention to how much formula your baby intake in each feeding and watch their weight gain over time. If your baby exhibits signs of discomfort, such as spitting up or gagging after a feed, it is likely that they are taking too much at one time. In this case, try:

  • breaking up the feed into smaller amounts
  • increasing the frequency at which you are offering bottles instead of increasing amounts per feedings.

Signs of Hunger in a 3-Week-Old Baby

Understanding when a baby is hungry is one of the most important things parents can do when they have a newborn. Knowing how to recognize signs of hunger in a 3-week-old baby is key to providing your infant with the nourishment they need. Babies typically begin to eat around the three-week mark, so understanding when and how much to feed your infant is important for their health and development.

Let’s take a look at some common signs of hunger in a 3-week-old baby:


Crying is one of the most common signs of hunger in babies of any age. A 3-week-old baby may cry for many reasons, including hunger, discomfort, itchiness, or wanting to be held and cuddled. However, if a baby has been adequately fed and there are no apparent issues (i.e., diaper change needed), then crying is likely due to nutritional needs that require you to feed your baby formula or breastmilk.

Additionally, some babies will thrash their arms and legs while they cry due to their overwhelming need to feed – take this as a cue that your 3-week-old is ready for more food!


Rooting is an instinctive response present from birth in which a baby will turn their head and nuzzle against a surface in search of food or comfort. This behavior is often the first sign a baby will give to indicate they are hungry and ready for a feed.

To test for rooting, lightly stroke your 3-week-old infant’s cheek with your finger or an object like a cotton swab, and watch to see if they turn their head to the side in search of food. Rooting can also be observed when parents offer a pacifier or the nipple of an expressed milk bottle to calm an infant down. If it is done during feeding time, it can be seen as the craving of hunger before being satiated with milk.

Smacking Lips

One way to tell if your 3-week-old baby is hungry is to watch if they are smacking their lips or trying to suck on their hands. Babies may do this when they are searching for a nipple or something else that satisfies their hunger. This behavior can also be a sign of comfort seeking, since babies have started to get used to having that full feeling in their mouths from nursing or bottle feeding. You should be able to tell easily whether your baby is uncomfortable, or simply searching for something to eat.

Other signs of hunger in a 3-week-old baby include:

  • Turning towards you and rooting around with their mouth
  • Making whimpering noises due to discomfort
  • Fussing when the parent gives gentle cues such as stroking their cheek with a finger or lightly blowing on the ear lobe area
  • Crankiness can also be a sign of hunger in this age group, but it’s important to pay attention closely and observe other cues before determining if the baby needs food.


At around three weeks old, your baby may be stirring more and becoming increasingly active. This often indicates that they are hungry. Generally speaking, newborn babies need to eat every 2-3 hours. Your baby may arch their back or turn their head away as indicators of hunger if they are thirsty or need to feel secure in their environment.

Other signs include licking lips, making sucking noises and putting their fist in the mouth, all of which can help to soothe a fussy baby and make them more comfortable. Crying is usually a sign that the baby is already very hungry; however it can also indicate that they are uncomfortable or need another form of comfort such as cuddling or rocking.

Signs of Fullness in a 3-Week-Old Baby

As a new parent, it can be difficult to know how much and how often you should feed your 3-week-old baby. It’s important to recognize signs of fullness in your baby so you can adjust the amount of milk they are receiving to the right amount needed. When a baby is full, they will usually demonstrate certain behaviors that will indicate they no longer need to eat.

In this article, we will discuss the signs of fullness in a 3-week-old baby:

Turning Away from the Bottle or Breast

In a 3-week-old baby, one sign of fullness is when they turn away from the bottle or breast. Many newborns startle and make stronger sucking movements during feeding because of the overstimulation with so many different sounds and lights. However, as your baby snuggles closer to feed and begins to suck more slowly and with less enthusiasm than before, this could be a sign that he or she is full.

If your baby has been drinking at an accelerated rate for some time, you’ll want to check in with them if they abruptly slow down. The best option at this point is usually to take a pause in the feeding session rather than continue. If your infant turns away from the bottle or breast altogether, they are definitely full and it’s a good idea to stop immediately and burp them if necessary.

It can be confusing when a seemingly hungry newborn suddenly turns away from the bottle after just a few sips – but it’s important not to push them too hard or force them to finish feeding when they seem full as this could lead to poor overfeeding habits later on in life. Overfeeding can cause gas discomfort, spitting up, colic, and difficulty gaining weight efficiently for healthy growth—all which can be avoided by listening for these signs of fullness at an early age.

Falling Asleep During Feeding

At 3 weeks, baby’s stomach is about the size of a walnut and can only hold about 1-2 teaspoons at a time. As a result, baby may fall asleep in the middle of feedings often. This is because even small amounts of milk cause their stomach to stretch and become full. When baby does this, it’s important to let them finish the entire feeding without interruption so that they get all the nutrition they need.

If you find that your baby is falling asleep during feedings or after only having a few sips of milk, gently try to wake them up by tickling their feet or jiggling their bottle. It’s also important to not overfeed your baby as this could cause them to have trouble with digesting due to an overly full stomach. Also be sure to burp them frequently while feeding so air won’t build up in their stomach and make them feel uncomfortable afterwards.

Spitting Up

Spitting up is a common symptom of fullness in babies at any stage. Often this is due to the infant drinking more milk than they can handle, or simply not having enough strength to swallow it all without some spilling out. However, as your 3-week-old baby begins to digest food more efficiently, they may also begin having stronger reflexes that can help bring unswallowed milk up and out of the body, much like belching or burping.

While true spitting up could come in larger streams, many times spitting-up babies will have small amounts ooze out of their mouth whist they are trying to eat or soon after finishing a meal. If you ever notice blood while your baby spits up this could be a sign of an underlying medical issue, so be sure to contact your pediatrician if you’re concerned.


In conclusion, the amount of food your baby will eat at three weeks old can vary greatly depending on their size, appetite and health. Most babies need to consume between 4-7oz of breast milk or formula every three to four hours. It’s important that you track your baby’s growth and development, so making sure they are getting enough nutrition is essential.

If you find that your baby’s appetite is changing or that they are not gaining weight quickly enough, speak to your pediatrician for advice on how to promote healthy development.