Bubba has been spitting up/vomiting almost regularly at this point along with persistent gas/bowel issues. He'll be backed up for almost a day and a half crying and straining before anything happens in one shot and the cycle restarts. He is clearly suffering

Anyway we've been using Enfamil newborn and were thinking of either switching to Similac or a different type of Enfamil. I called our doc but he's out of town (...hah) and waiting til Eli's appt on the 13th would be torture.
Anyway! Anyone know if we should ween him off of the current formula into the next (kinda like a cat, mixing it together before switching fully) or just full stop give him a bottle of New stuff?
Suggestions appreciated !!
Re: Switching formula brand/type
Our DD spits up, we switched her to a new bottle with premie nipple. Maybe the flow is to fast? Is he burping well after every ounce or so?
Thanks for everything !
Married - 10/10/2009
DS - Due 11/3/2012 born 9/28/2012 due to Severe Preeclampsia and HELLP Syndrome
DD - EDD 12/30/15
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Switched to gentlease today and looking into the nipples.
Before this, we moved him down from size 1 to size 0 because he was eating too fast and getting it everywhere.
We use Avent Naturals bottles.
He he has some potty issues, too, but not sure if they are different yet with the different formula. I use gripe water when he seems to be too gassy and uncomfortable.
Jamie