My 3 month old Son has decided that sitting up is his new favourite thing. He'll hold his arms out when lying down for me to lift him to a sitting position. He was even grumpy in bed this morning until I sat him up (I'd already winded him, it wasn't that). He gets a look of 'ooh, look at me being clever' whenever he's sitting and seems to like the new view of things. Obviously I support him at all times when he's sitting up. He has good head control. I'm just concerned to know whether his spine is strong enough to support him sitting yet. Should I be waiting til he's older to help him to sit?