What to know about stomach size in babies

The article is consulted professionally by Specialist I Nguyen Thi My Linh – Pediatrician – Pediatrics – Newborn – Share99 Da Nang International Health Hub.

While in the womb, the fetus eats with the umbilical cord, receiving nutrients through the umbilical cord, not eating with the stomach. That is why at birth the baby's stomach is very small and will increase the size of the stomach in the following days.

1. What is the size of the stomach in babies?

Day 1 – 2:The baby's stomach does not have good expansion and is smaller in size than peas, so it only contains about 5-7ml of milk once on the first day. This amount is equivalent to the precious amount of colostrum that the new mother secretes. Therefore, it is completely wrong for the mother to "line the stomach" for the baby with the amount of formula up to 30ml / breast and greatly affect the child.

Day 3 – 6 after birth: The stomach size of the newborn is about as large as a grape and can hold about 30-60ml of milk per meal.

1-month-oldbaby: The size of the infant's stomach is about the size of a chicken egg and can hold between 80-150ml per meal.

Children from 6 months to 1year: The young stomach is equivalent to a grapefruit that is small and 5 times smaller than an adult. At this time, the baby's stomach can already hold about 200 – 250ml of milk (equivalent to 1 cup of rice).

2. Children's eating needs through each stage


Although the stomach size of babies is small, the nutritional needs of the child are 3-5 times higher than that of adults

Based on the stomach size of the infant above, it can be seen that at each time, the baby will have different eating needs and even mothers just need to breastfeed the baby completely enough for the baby to develop best, not need to use formula.

In addition, although the stomach size of the child is 5 times smaller than that of an adult, in nutritional terms, the needs of the child are 3-5 times higher than that of adults. Accordingly:

  • A newborn baby will eat about 8-12 times within 24 hours on the first day. That is, every 1-3 hours the baby eats once.
  • For babies who are at the age of eating miles, it should be divided into 2-3 meals a day.

3. Gastric reflux in babies

Gastroesophageal reflux appears in 2⁄3 of children in the first years of life. The majority of gastric reflux in children will cease after 12-14 months. However, there are also some children who have a longer period of reflux. Gastric reflux is classified into 2 types: physical and physical.

Gastroesophageal reflux in babies is the phenomenon that the food. The taste in the child's stomach is pushed back onto the estasophageal. Then push up the throat and vomit out. It is also known as bazo reflux. It can appear in children at any time regardless of day or night. At this time babies mainly eat milk so will also just vomit out milk.

When having gastric reflux, babies will very often cry, quit feeding. At night it is difficult to sleep, sometimes having to hold it all the time in your hands. Prolonging the child will be prone to malnutrition and stunting.

If the baby is under 6 months old, a day is ironed a few times but still happy, gaining weight well, not wheezing over and over again…. it's more likely to be just a biological reflux. If the child still often has milk after 1 year, slow to gain weight, skinny, afraid to eat, wheezing, recurrent pneumonia…. it is more likely that reflux has become a pathology.

How to care for a child with gastroesophageal reflux :

For infants who have not eaten miles (children under 4-6 months):

  • Parents breastfeed repeatedly, the reasonable lactation time is 2 hours after the previous feeding. After breastfeeding, feeding the baby stands for 10-20 minutes. It should be noted that breastfeeding in the right position, sucking the right owl to limit the baby from swallowing vapors in the abdomen.
  • For children who usually use a bottle, parents see if the size of the milk rays is suitable for the baby.

Breastfeeding babies

For babies with gastric reflux from 4-6 months, the mother needs to breastfeed several times, each time 2 hours apart

For children who eat miles:

  • Parents should divide into several small meals during the day. It is recommended to feed the child every 1.5-2 hours.
  • Limit feeding babies high-fat foods.
  • Add 1 tablespoon of cereal flour and about 50g of powdered milk or milk from the breast milk to the bottle. If the solution is too dense, you can resize the nipple or cut the nipple into a small "X".
  • Regularly pat the baby's buttocks during eating to avoid milk ironing.
  • If an allergy to protein is suspected, give the child a decomposition protein formula for 2-4 weeks. This protein contained in milk has the effect of preventing milk irony as well as making the child "easily digested".
  • Do not over-breastfeed or eat too dense foods because it is easy to cause constipation, reducing the absorption of calcium content in milk.

Proper breastfeeding:

  • Parents need to adjust the feeding position of the child to be reasonable, avoiding milk down too quickly. The reasonable feeding time is 2 hours after the previous feeding. After breastfeeding, feeding the baby stands for 10-20 minutes.
  • Limit your baby's breasts to fake breasts a lot.

Besides, you should help your baby belch during or after breastfeeding. Mothers should do this when the baby sucks all one side of the breast or sucks all 50 ml of milk in the bottle. The simple way is as follows: the mother allows the baby to sit upright on the lap, so that the baby slightly leans forward, using one hand to support the chin, the other hand pats him on the back. With the above way, the baby will belch easily, avoidingthe barrier against the stomach after feeding.

Finally, when sleeping, parents put their heads a little higher than the body. This will avoid gastroesophageal reflux in young children.

Specialist I Nguyen Thi My Linh has 12 years of experience in diagnosing and treating pediatric diseases, especially newborn resuscitation and newborn treatment. In addition, doctors have strengths in the field of breastfeeding counseling as well as examination, counseling and nutritional intervention in children.

To register for examination and treatment at Share99 International Health Hub, you can contact Share99 Health System nationwide, or register online HERE.


  • Do not neglect with gastroesophageal reflux in babies
  • Vomiting after eating, belching: Prevention of gastroesophageal reflux in children
  • Instructions for patting your baby's belching back after suckling


  • Control post-birth baby pains
  • Methods of "freeing" the back pain for post-birth mothers
  • Post-cesarean back pain: What to know

About: Minh Quynh

b1ffdb54307529964874ff53a5c5de33?s=90&d=identicon&r=gI am the author of Share99.net. I had been working in Vinmec International General Hospital for over 10 years. I dedicate my passion on every post in this site.


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