Our health visitor says it can take 3 weeks for old formula to leave the body as such and be replaced by new one, but she didn't mention having to do it gradually just to stick with one or the other and be aware baby may react during these 3 weeks but you won't know if it's from old formula, new one or the fact it's mixed.
@Imicola it's what I found on google and my mum said to do gradual as may upset their tummy...but I've also read it shouldn't make no difference so confused 🙈 not seeing health visitor until 14th but didn't want to wait that long as little one has constipation
Has anyone swapped babies formula and just done a straight swap and it's gone okay? Or do I really have to do a long winded swap with a bottle a day of new milk? Baby is 4 weeks old and not getting on well with his milk, so want to swap him onto what the hospital gave him as worked well