14 month old acts like newborn(Long)

Taylor • Married❤️24❤️3 boys❤️#4 in 2022

i have a 14 month old and im currently 35weeks pregnant. He's barely eating. my mom said his stomach is still small but Everytime i feed him he eats a bite and wants milk only. i gave him cereal he ate that for dinner. For breakfast i cooked pancakes eggs and sausage. he eats two bites and the rest i have to force him to eat. i gold off on the milk until he really refuses to keep eating. lunch i gave him corndog and juice. again he ate 2 bites. and deunk a lil apple juice i tried giving him another bite and he threw up everything. he tends to gag wen i try giving him any type if food like he inly prefers milk. i need help with what to feed him. its currently 4am. i gave him milk because usually he gets thirsty ate night. 30mins later he's up again crying so i just fixed him chicken nuggets. be ate half of one wow. and so i tried a banana he ate a half of piece with me forcing him to try. no luck so i just rocked him back to sleep. i just put a lil yogurt in his cup so when he wakes up for breakfast before i get up at least he'll be a little full. The reason i say he actd like a new born is because he constantly wakes up at the same time every night for milk and then i have to rock him back to sleep. i dont want this interfering with the newborn. having him constantly waking up the baby with his whinning. any suggestions