I would say it's the heat. The heat at the moment isn't just hot it's muggy here in Melbourne, so you probably need to drink more water?? I ended up with a thumping headache last night which I attributed to not drinking enough often.
Yesterday Tess fed alot during the day. Lot's of one side, happy, rest, another side. She fed frequently and only one side at a time.
Shae is also nearing 3mths so would be having a growth spurt.
Try (it's not easy) to compare her to other babies, she could be just petite.
And the impatience on getting on the boob...yep!! Tess get's excited and cranky all in one
You are doing a great job Nae, your judgement is spot on.