Hello again, glad to see this thread is back up and running, I thought everyone had given it up! Lovely to catch up on all the news.
DS2 is a bit of a terror, he's into everything and a climber. We've had to do lots of babyproofing (we never got round to it with DS1) and he encourages DS1 to climb things with him, he's a bad influence!
My (totally unscientific) theory is the less they sleep, the earlier they walk and talk. DS2 is also talking a lot, particular focus on food items and 'more'.
I don't know what he weighs but he's managing to remain fairly chunky so far.
Sleep is still pretty bad here, the couple of nights when DS2 has had a long unbroken stretch, DS1 has woken up. I did think DS2 was starting to improve a lot but he's regressed again, he's had a cold for ages and I think a few more teeth are about to break through, back to lots of night waking and unsettled evenings.
Despite the lack of sleep and the moments of terror, DS2 is great to have about. His favourite baby book is one with wave, smile, hug, kiss pictures and words - he does all the actions along with it and it's the cutest thing to see. I'm also loving it now both DSs can play together a bit, the sound of them both laughing together is my favourite thing ever! 
Blanche - sorry to hear about the coeliac, if you do want any gluten free cake recipes, my mum makes lovely cakes so I can pass any on.