Ok Mommies....it's been a long time since I had a newborn (10 years 😳)

How did you all transition from the small hospital bottles to regular bottles? I tried yesterday and baby boy was up screaming for 2 hours last night, with no ease. I think he had gas and it's from the bottles! So, any help would be appreciated!

Also, baby boy hasn't pooped yet today...he only had 1 poopy diaper yesterday and it was a small amount....he hasn't been seen by his pediatrician yet, his appointment is Tuesday...should I call or just wait to speak with him then?