My son was born at 34 + 5 and is now a couple of weeks old. He spent 10 days in the neonatal unit to establish feeding and was discharged on Monday being bottle fed the 70ml ready made SMA bottles as my milk supply dropped when i was discharged from the hospital. We gave him the remaining ready made bottles then started him on the powder formula using the perfect prep machine yesterday but he has had terrible gas after every feed since starting this, he seems to be in a lot of discomfort for quite a period of time after feeding it just doesn't feel right and we are a bit uneasy with it. We tried giving him another type of formula but had the same problem, has anyone had this issue before? He is fine on the SMA ready made bottles. We are going to continue with the ready made bottles in the short term but the other thing we are unsure of is if we can heat/warm the formula after it has been refrigerated? Any advice would be appreciated!