In the fourth month, your baby will show a marked improvement in terms of physical, cognitive and communicative development. Let us take a brief look at what you can expect from your four-month-old.
|Growth Details||Boys ||Girls |
|How much should a 4-month-old weigh||12.34 to 18.95 pounds||11.24 to 17.85 pounds|
|What should the height of a 4-month-old be||23.62 to 26.69 inches||22.8 to 26.06 inches|
|How much should his head size be (97 percentile babies) ||15.5 to 17.28 inches||15.03 to 16.92 inches|
Being able to use both his hands in a flexible way, your baby’s grasping and grabbing skills are improving, making him able to shake or play with a toy . Having a better head control, he can hold it in an upright position along with his chest when lying on his tummy .
Most infants begin rolling over from their stomach to back , also displaying kicking and pushing motions of their feet  as well as arching their backs . Babies also develop the habit of putting everything into their mouth, which is probably their way of exploring the world around them .
With an advanced brain development, he can convey to you whether he is pleased or displeased as well as respond to your affection . The baby also starts establishing eye contact with his parents and acquires the skill of memorizing. He will smile to acknowledge something amusing whereas some may even laugh out loud. Most of them may demand their parent’s attention all the time desiring to be cuddled or held .
They even start anticipating things, for instance in case your baby is formula fed, the sight of the bottle will make him think that it is time to eat .
Though crying may still be a way of communication, your baby will go on to express himself by making a lot of vowel sounds such as ‘aahh’, ‘ooh’, followed by squeals, laughter, coos and giggles . He even shows variation in his crying to convey different emotions such as hunger, tiredness or pain .
Their sharp vision enables them to distinguish similar-shaded colors such as red and orange , as well as subtle color contrasts like a blue spoon on a blue plate . With an improved hand-eye coordination, they look at toys and attempt getting them . Their tracking and following ability has improved , though preference for close-ups remain [1,2].
A four-month-old can recognize his mother’s voice well, responding by smiling on hearing her speak. He will even react in an excited way on hearing new sounds .
Most babies will sleep for seven to nine hours at a stretch at night. In fact, he will be sleeping fourteen to sixteen hours in a day with the two naps being taken into count [1,2].
Sleep regression is a common trait mostly observed in four-month-olds, characterized by inconsistent sleeping patterns . Its symptoms include changes in feeding pattern, fussiness, prolonged crying, remaining awake for a longer time, missing naps or sleeping for short periods . One of the main causes may be that he does not directly enter into a deep non-REM sleep, thus getting distracted easily .
Formula-feds will have four to five feeds a day at increased intervals  whereas breastfed babies take six to eight feeds daily. As your little one’s brain is maturing, he may get easily distracted and restless while feeding .
Although some babies show teething symptoms like drooling or excessive saliva secretion at this age, with a few of them actually cutting their first tooth , solid food is not recommended yet as they get all the required nutrients from the breast milk or formula food . Their tongue-thrust reflex goes away by this month, but they are still not ready for solid foods .
However, if your baby is not contented with the breast or formula milk he gets, talk to the doctor about the same. He may recommend solid food such as rice cereals, as long as the infant has a good control of head and neck, being able to sit with support .
Babies on solids may get constipated as their body is beginning to adjust to the new food . Moreover, it is normal for kids to pass stool once in three days as long as it is soft and they are gaining weight .
5-in-1 vaccine (DTaP/IPV/Hib): The third dose of this shot is given to fight against five different diseases namely tetanus, polio, whooping cough (pertussis), diphtheria and Hib (Haemophilus influenza type b) .
Pneumococcal: At this month the second dose of this vaccine is given to help the body combat pneumococcal diseases leading to pneumonia, ear infections and meningitis .
Rota: A second dose of rota vaccine is given at the fourth month to fight against rotavirus that may lead to fever, vomiting, severe diarrhea, and dehydration .
Published on July 24th 2015 by Pregmed Editorial Team.
Article was last reviewed on 12th September 2015.