TL:
baby: Yu

baby: Yufu-...

Reimu: Yu?

Reimu: Yuha!?

Reimu: Yu-...Little one...did sleeping pee-pee ne.
Yu?

Reimu: Yuyu?
Marisa!? Little one!? Where did you go!?
I hope this doesn't mean something.
baby: Yu...?

I'm not sure if the small text in the last panel could also mean "I don't care what happens to that baby but..."

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Translation: post #21168