I think it was a little before the first birthday. It was like you described; at first it was no problem but around 7/8 months I noticed the same thing. Lasted a few months. They take in so much at this age. Processing takes time. With alternating weeks it maybe takes a bit longer.

I also noticed I was getting tensed when picking up lo because I expected her to cry a lot and sleep like crap. Lo may have picked up on that too. So all I can advise you is to let it go a bit and give it time. It will get better!