My lovely 14wk DS has been on standard SMA formula since 10 weeks, prior to which he was EBF.
The first couple of weeks went really well; regular feeds, plenty of wet nappies and regular (2-3 times per day brownish peanut butter texture poo). We started with ready made but then moved on to powder using a perfect prep machine. He seems happy taking it warm from the pp or at room temp when I take a prepared bottle out with me.
The last couple of weeks have been completely different. Suddenly becoming screamingly hungry but then fussing on the bottle and crying. Only taking 3-4oz instead of 6. Lots of wet nappies but really irregular poos; not even one every 24 hrs and they are more runny and yellow. He is not a particularly sicky baby but he is being a bit more sick than I would expect. Lots of farting. Generally grizzly but with flashes of the perfect boy he was a couple of weeks ago.
I have looked at wonder weeks and he should be in an ok period right now.
I think he may be constipated which would explain the fussing and straining (he usually poos while feeding) and may explain why he doesn't seem to want to take much at a time.
Should I consider changing formula - does anyone have any recommendations - or should I take him to the doctor to see if he needs any medicine to get things moving again.
TIA.