Have 4 week all baby, has been having a ‘top up’ formula bottle of Aptamil Pro Fortuna every night since week 2. Has been completely fine and took bottle no bother, hasn’t had an impact on my milk supply. Baby has been constipated since Monday - only had 1 dirty nappy per day, and none today! Lots of wets, just no poos! Could this be the formula? Should I try a different brand? Or could it be from the breast milk? I’ve had to be on antibiotics the last week or so (breast abcess) or something I’ve eaten? Is there anything else that I could try? I can’t express due to severe bruising and nipple damage (she had a tongue tie which has now been corrected but left me with a lot of pain) and so keen to continue with formula so that I get a rest (and so do nipples!) but also so I can continue with the bottle. Any tips?!