My 14 w/o lately only breastfeeds for really short periods during the day - about 5 minutes at a time, every 2 or 3 hours. I've always had quite a ferocious letdown (spraying and leaking a lot ) but I often don't feel very 'empty' after a feed. She seems healthy and happy and is filling nappies etc but I'm worried she's not filling her tummy. Anyone else have experience of this?