General Practice 2022

Baby developmentê with 3 months: weight, sleep and foodção

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Baby developmentê with 3 months: weight, sleep and foodção
Baby developmentê with 3 months: weight, sleep and foodção

Baby at 3 months already recognizes the voice and image of parents, guardians and family members better, moving the neck towards people, voices, objects and sounds. In addition, when placed on their stomachs, babies are usually able to lift their head, part of their torso, and their shoulders.

At 3 months, babies develop more facial expressions, smiling at people, in response to stimuli, and they can also slap their hands or grab a toy that is close to them.

Baby at 3 months should be fed exclusively with breast milk, exclusively and on demand, which is when the baby wants to breastfeed. However, when the mother is unable to breastfeed, the Brazilian Society of Pediatrics recommends feeding with infant formula, following the pediatrician's recommendations.

It is important to note that each baby is unique and has its own rhythm of growth, sleep, speech and play. Therefore, in cases of doubts about the baby's development, it is recommended to consult a pediatrician.

Baby weight

The following table indicates the baby's ideal weight range at 3 months, as well as other important parameters such as height and head circumference, according to the World He alth Organization:




5 to 8 kg 4.6 to 7.5 kg


57.5 to 65.5 cm 55, 6 to 64 cm

Head circumference

39, 2 to 41, 7 cm 38, 2 to 40, 7 cm

Monthly weight gain

700 g 700 g

If the baby presents values ​​above or below those indicated, it is recommended to consult the pediatrician to assess the child's development.

Baby sleep

A 3 month old's sleep usually lasts around 16 hours a day which can be regular, with long hours of sleep at night. However, some babies may wake up at certain times during the night from discomfort, such as hunger or urine or stool in the diaper.

If your baby is in the habit of “changing day for night”, it may be interesting to practice a daily “ritual”. Some tips to help your baby get a good night's sleep include:

  • Reduce noise in the house and ambient lighting to calm the baby;

  • Bath the baby before bed so he can relax before bedtime;
  • If the baby wakes up too early, rock the baby in the crib so he/she sleeps a little longer;
  • Do not let the baby sleep in the parent's or guardian's bed.

It is important to try to maintain the same routine every day before bed, so that the baby gets used to the sleep schedule, which should be continuous and last around 10 hours a night. See more about how long your baby should sleep.

Baby feeding at 3 months

According to the Brazilian Society of Pediatrics, a 3-month-old baby should be fed exclusively with breast milk and on demand, which is whenever the baby wants to breastfeed.

It is important to maintain exclusive breastfeeding until the 6th month, as breast milk offers all the nutrients and water that the baby needs.In addition, it is also recommended to offer breast milk, when possible, up to 2 years or more. Discover all the benefits of exclusive breastfeeding up to 6 months.

In cases where the mother cannot breastfeed, the Brazilian Society of Pediatrics recommends the use of infant formula, where the type and amount must be recommended by the pediatrician.

It is worth remembering that babies who are fed infant formula should drink 700 ml of water, distributed between the water used in the preparation of infant formula and pure, filtered or boiled water throughout the day, to avoid constipation. belly and kidney overload. Know the amount of water according to the baby's age.

Baby development

At 3 months, the baby starts to recognize the voice and appearance of the family more, relating better through the look, with smiles and babbling some sounds.

By having the clearest vision, the baby already observes and follows people better with his eyes and moving his neck. At this age, the baby can also pick up or hit with his hand a toy or other object that is close to him.

In addition, when placed on the stomach, the baby is able to lift and better control the head and trunks, being able to change from the dorsal position to the prone position. From this stage, care for the baby must be redoubled, to avoid falls or other accidents.

When to vaccinate the baby

At 3 months, the baby will only need to take the first dose of the Meningococcal C (conjugate) vaccine, against infection caused by the bacterium Neisseria meningitidis, which can cause severe inflammation in the central nervous system. Know the vaccines that the baby should take according to each stage of life.

Games and activities

The games at 3 months help to stimulate the baby's cognitive development and increase the bond with the parents or guardians and some interesting games are:

  • Put the baby on your lap in front of the mirror, showing and talking about each part of the body, to help develop the perception of your own image and the baby's vision gradually;
  • Take the baby for walks in open and airy places, such as squares and parks, preferably before 10:00 or after 16:00;
  • Reading to the baby, varying the tone of the voice, to help develop hearing and increase the affective bond;
  • Sing the baby calm songs, fun songs, smiling and looking him in the eye;
  • Give children toys to pick up with their hands, to encourage knowledge of different colors and textures

When playing with the baby, it is important to give him time to react and respond to the stimulus, as he still has a little slow responses at this stage.

In addition, toys must be large, without tips and specific for each age group, to prevent the baby from getting hurt.

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