Formula poop

Adika • just a bomb ass mom who all her dreams came true when i gave birth to my son. wifey since nov 2016
Baby is 2 weeks drinking 2 oz of nutramigen every 2- 4 hours...having a painful time trying to poop. He just pushes and pushes and grunts and farts but no poop and when he finally poops its either pretty normal🙂 or just a streak😣 but not hard like constipation poop😕.... about 5 poops a day.....whats goin on ?????