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I would say that if he's putting on weight fine, wet and dirty nappies aplenty and having alert spells then he has got the hang of it and just very efficient.
Try not to worry about what you think he should be doing, they're quite clever these babies and can sometimes just get on with feeding.
M (15 weeks) will not feed unless she's hungry and has tantrums if i try to feed her when she isn't interested so i just need to stop trying and trust she'll let me know when she wants more. My eldest would take the boob at any point it was offered though, they're all so different!
Try to relax and go with it. I'm pretty sure you've broken nothing and are just (understandably) getting worried about everything. Do you offer both boobs each time? Maybe when he's finished, do a bit of winding or a nappy change then offer the other side? Although in all honesty if the GP etc are not worried then I'd try to take their word for it. HVs GPs etc will be the first to worry about poor feeding.

Naomi ~ July 07 (10 days late 5lb 2oz)
Melissa ~ July 09 (1 day late 7lb 1oz)