Probaly is just the heat, how old is dd?
My 14mth ds usually puts away a good 8-9 ounces at breakfast, today just 2 if that. He was the same last summer when he was only 3 mnths. If not taking milk, try her with cooled boiled water or diluted juice depending on age. It won't do her any harm to miss a couple of feeds or even a day on half feeds just make sure she is getting enough liquid in other ways. Is everything else ok?
Experiencing the opposite! 3 week old dd has been b/f almost constantly today. Started at 6am and since then 10-15 min slurp followed by 30 min nap all day. I'm exhausted. Tried boiled water and she hates it. Now resorting to a formlua feed as I need a break!
Abow, just a thought, my first hated water with a passion until I gave it at the temperature as you would a bottle and I smeared a bit of breast milk (I imagine formula would do) around the teat. At first it was a few more sips than he had been taking but gradually he started to take it well. Glad to hear you are taking a break, that breast feeding on demand is totally exhausting, especially when the little darlings sip and nap!
Tinker - I sympathise. Dd is worse today than yesterday but dh is being great and with me b/f, and him feeding ebm and formula he's helping me retain my sanity. As a distraction I've given her several baths today which seemed to help her calm down a bit. And they say July and August are going to hot...