Babies need to eat often but they also need (this is their authentic need) to be held, burped, changed, moved around, talked to, smiled to. Sometimes they are tired and need to get away from too much stimulation. Too much light, noise, activity may make them cry. They get easily overtired and may have trouble calming down. They still don't know how to go to sleep on their own. They need parents, usually mom to help them with that.