We started at 6 months (well 6 months, one week and one day actually
 ). As Amiee mentioned, I too have concerns about gut maturity before then. We give J table food but we don't give her anything and everything. She has no grains or meats and has only had dairy products a couple of times in very small amounts.
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She doesn't swallow much but that is of no concern to us. "Food before one is just for fun" is our motto. I would say she gets 99.9% of her nutrition from BM (she's 8 months now). However, she has an absolute ball exploring foods and will taste anything we offer. For us, this is what it is all about, exploring good quality, whole foods.
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Interestingly, the other day I was sitting with her and eating a yoghurt which I didn't want her to have (dairy, sweetened etc). She kept grabbing for the spoon and I gave it to her. That's all she wanted. Even when I got another spoon and kept eating. She didn't want the yoghurt, not surprisingly as she didn't know what it was, she just wanted the intersting thing in Mummy's hand. This little bit of anecdata helped to validate my, long-held, view that "interest in food" is actually interest in the brightly coloured things which Mummy and Daddy pay so much attention to. They don't know what food is. They can't relate a feeling of hunger to the act of eating table food. They put everything in their mouths. As one mama on here put it "if I had a crack pipe in my hand she's want that too. Doesn't mean she's ready." If I'd given her food at 4 months she would have put it in her mouth, and maybe even swallowed some but it doesn't hurt to wait IMO. We used to put J in her highchair, at the table with us and give her a toy or a spoon to play with. It made her part of the activity, she was happy and we could eat with both hands.