I'm concerned that I'm not worried if that makes sense.

I weighed DS2 (8 1/2 mths) today and he's now below the 25th centile, last time I weighed him (3 mths ago) he was just below 50th centile. I think he's fine, he feeds on demand still and loves playing with food, lots of wet nappies etc, but a small part of me thinks maybe I'm wrong to be unconcerned.

Thanks.