Baby eating

Jordan • Married 2/2/18. Ole Royce born 3/27/19 dog mom x2 ttc#2 ~19 months 😕

My son is almost 7 months and is on formula and i am having a hard time getting enough in him for the day. He used to eat 30-35 ounces and now i can barely get 20. He gets so distracted when eating and i tried going it k a dark quiet room and it doesn’t help and now he is waking up at night a lot and screaming bad. Just hoping for some tips to try so he can sleep better and eat more during the day