Hey darl... DD doesnt have many wet nappies either- i actually called the ABA because i was a bit worried and couldnt remember how many she was supposed to be having at this age- i was told four- this can include a poo nappy as they generally wee when they poo- but DD would be wet in the morning, poo mid morning then i wouldnt need to change her til the afternoon- i would sometimes change her almost unneccessarily, sometimes she would be in te same nappy until bed time (7-8pm) and then in the night time nappy til 9am.

DD was getting really unsettled in the afternoon and at night and i have actually been topping her up with formula (dont shoot) and since then her wee nappies have increased dramatically. I am still feeding 2-3 hourly all day, but come the afternoon she just wants more then i have- and the extra boost of drink seems to be agreeing with her. They are the same age- so maybe its just that time, as it seemed to be about a month for us too. Not sure if that will help you though as you say DS is happy and fine, but maybe call the ABA and see- or like Spring says, go to the hospital just to get a check out. Hope you get some reassurance!!