hi Dr my 4 month old baby has suddenly become quite she started actively babbling at the age of 3months...past 1 week she has become very quiet health wise she seems normal to me what could be the reason I try to engage her play sing talk anything else I could do

A. If a baby isn't babbling normally, something may be interrupting what should be a critical chain: not enough words being said to the baby, a problem preventing the baby from hearing what's said, or from processing those words. Something wrong in the home, in the hearing or perhaps in the brain.