CMPA vs Lactose Intolerance

[Gemxx86xx]

Does anyone have any experience of a baby having both cows milk allergy and lactose intolerance
Our little boy was born at 36+5 and had numerous problems since he was born
He lost a lot of weight and was really constipated, they came to the conclusion he was cows milk allergic was he was prescribed nutramigen however this made him violently sick.
We saw a different GP who said he sounded lactose intolerant so switched him to SMA lactose free. This did help for a couple of weeks however he soon went back to being constipated and in pain all the time
We saw a different GP this week who said he definitely sounded cows milk allergic so prescribed Aptamil Pepti 1 to try, straight away this helped his constipation he's now going regularly however the vomiting has started like he was on nutramigen
I know the nutramigen and apatamil Pepti 1 both have lactose in
I'm wondering if he's both cows milk allergic and lactose allergic

Lactose intolerance is very uncommon in Northern Europeans and not generally in babies at all (as breast milk also contains lactose). CMPA pretty common in contrast.
You haven't mentioned an age for your child. How big a problem is the vomiting? Sometimes specific reflux treatments can be needed, sometimes you can ride these things out and they get better with introduction of solids, more time in an upright position, etc.

I should have said he's 13 weeks old but 3.5 weeks premature
He's never really been one for vomiting but he did the same on the nutramigen as well

I've seen the GP again today who said himself it was rare for a baby to have a lactose allergy and the nutramigen doesn't have lactose in but he was still sick
He thinks he does have CMPA and a severe acid reflux so he's started him on ranitidine and agreed to add carabol into his bottle to try and thicken it
Finger crossed this works I feel I'm constantly at the doctors with him

Your LO needs a hypoallergenic one like Alfamino, Neocate, puramino. The pepti and nutramigen ones are extensively hydro lakes so do contain protein in a very very broken down way. Most babies cope well, some do not. My two reacted to it and needed Alfanino. It's not lactose intolerance but the severity of the CMPA. Ask your GP for one of the ones I listed.

Hydrolysed - typo on previous one

Nutramigen is Lactose free (well the one i use is)
So I dont see that it could be the lactose - maybe ask to try Neocate.
Apparently lactose intolerance from birth is quite rare - my DD was temporary lactose intolerant from a 30 day bout of diarrhea. They gave her Nutramigen incase it was CMPA too but luckily shes now just on Aptamil Lactose Free