Your little one is growing more social and moving more purposefully. Babies at this age love to babble, coo, play and mimic the sounds they hear and movements they see. You’ll start to notice that their cries will start to sound different as they learn to communicate hunger, frustration, discomfort and sleepiness. Have a look at the articles and videos to find out more about some of the ways your 4-month-old is learning and changing at this stage.