It all sounds ok to me, you have a nice healthy boy who works really well for 20 mins to fed, falls of and is full.
Cant get better than that !!!
If nappys are wet and baby is healthy , you have cracked the breastfeeding with this one.
Every baby does the breastfeeding thing slightly differently.
my n1 hung on for hours, and only a dummy saved my sanity. fed for 12 months
N2 was a big baby ( had lots of nonsence about it being difficult to fed a big baby, he was 10lb 8oz ) he fed three hourly from the start, fed quickly and slept. Wonderful!! fed for 13 months, then rejected in favour of thumb.
n3 was very difficult to feed, arching back , screaming, colic, total nightmare infant. always underweight, but fed enough, was presured to put on formula, I wouldnt have it, and turns out he had all the allergies. Still at 10yr underweight, but is OK. fed for 18 months
N4, was one of those dreamy feeders, loved it, lots of colic and screaming non stop ( screamed for 11 hours one day) after three months easy peasy lemon squeesy, stopped at 2 1/2
Not recommending this long term feeding stuff, it doenst suit everyone, and to be honest, was glad to have boobs back ( so was hubby)
Health wise they are all ok, One of my children has never needed antibiotics, one has had them once, another has only needed them three times, the middle child has had lots and lots and lots ( different story)
Sorry to witter on