I suspect the concern has arisen because he was such a big baby at birth (9 pound 10!) but now is down to approx 10-20th pc ...

But I'm a lot calmer now - he eats well, his sleep is fine albeit irregular (but over any 24 hours, he gets plenty ITMS), he is engaged and happy and wets plenty and poos most days.

He cries a bit - but not excessively ... I just hate it when he cries, because he's my son!

He despises tummy time and screams blue murder when we put him down for tummy time - but that's nothing to do with whether he's underweight ...

Life goes on, right?