Hi, This is very common at this age. Feeds when he is about to wake up and not in a crying baby

This is a common observation to hold breath while crying, usually it is a benign act and can be relieved by a pain ful stimulus. Some times apnea may lead to cyanosis or blue baby syndrome which is a sign of severe congenital heart disease If child turns blue while crying see a pediatrician to know cause of blue lips, it’s an emergency