By the age of four months, your baby’s weight will likely have doubled from birth. If you are concerned about his/her eating or his/her weight, consult your pediatrician.
Your baby’s hands will now work together to move a toy or shake a rattle. His/her hands will reach out for anything, including stuffed toys, your hair, or any colourful object lying nearby. Almost everything that your baby is able to pick up will likely end up in his/her mouth — tasting is one of the ways he explores his/her world.
By this time, your baby’s head should not be wobbly anymore. He/she has good head control while sitting supported and can hold his/her head and chest upright while lying on his/her stomach. He/she can also kick and push with his/her feet.
At this age, he/she may sleep seven to eight hours in a row. In two different sessions, he/she should be sleeping 14 to 16 hours a day.
By four months, your baby’s vision has sharpened and he/she should be able to pick out more subtle colour contrasts, such as a blue button on a blue shirt. Your baby’s eyes should move together smoothly and follow objects and people around the room. If you see any vision problem, inform the pediatrician.
Usually, pediatricians do not recommend starting babies on solid foods until six months. But bigger babies may not be satisfied with breast milk or formula alone. Your doctor may ask you to start solid foods at four months.
Your baby is starting to discover himself as a unique individual. He/she is noticing that people around him/her are responding to his/her actions. He/she will be expressing himself with his/her coos, oohs and aahs, gurgles and laughter. He/she will also be able to express a wide range of emotions, from a happy smile, to an angry face. He/she is learning to read emotions from your voice and facial expressions.
Talk to him/her as often as you can. He/she is learning all the time. He/she is starting to figure out that your message is broken into syllables. Soon he/she will start experimenting with these syllables.