Layla that playmat is gorge!
Hiya Kookie, Oliver can roll to his side slightly when on his back and he can lift his chest clear off the ground when on his tummy. If he's in his pushchair he tries really hard to sit up by hiself and can do but only for a second or two, then gently falls back into the backrest. Sounds like Tyler's doing ace!

I'm sure i read somewhere that its about 4months when they can roll over, but not sure! x