DS2 is a chubby little lump who eats like a horse and likes nothing better than to be carried around all day. He can sit by himself, but I'd never leave him without cushions as he throws himself back, safe in the knowledge something/one will catch him. If I lie him on the floor he wails after about 2 minutes, but can just about roll onto his tummy from his back (he seems to have forgotten how to roll back onto his tummy though). Should I be worried? I'm fed up of carrying him and am going to have one very misshapenly large bicep on the beach this year!