The most sensible thing I’ve read is that a lot will depend on your starting weight. Overweight women don’t’ ‘need’ to put on as much weight as underweight/healthy weight women.

I was 166cm (actually still am) and 74kg when I got pregnant which is officially overweight. I’m now 24 weeks pregnant and 73kg (so a 1kg loss). So as an overweight women, my body didn’t need to gain too much weight to support my pregnancy. Added to this, I’ve drastically cut down on my visits out for mammoth sized pub meals and accompanying alcohol. So, no diet, just being sensible and less calories (mainly from the booze) means I’ve lost weight. No rocket science there. And yes, my baby is a completely normal size which is the most important consideration here.

On the other hand, a colleague’s wife who was officially underweight at 49kg went up to around 70kg because that’s what her body needed to do.

So, I’d say be honest with yourself. If you were a bit on the skinny side or if you were just an average size, then 10kg doesn't sound excessive. If, on the other hand, you were like me, then you probably don’t need to put on heaps and don’t fall into the trap of telling yourself that you do and/or that it will be easy to lose later.