My lo, when smaller, always wanted to feed right when she woke up.
I worried that I conditioned her to need that, but eventually she stopped needing to eat the minute she woke.
It could of course be because she smells your milk as well. I know at night, when lo's are waking out of habit, the best thing to do is have the dad go in or someone other than mom (if bfing) because they can smell the milk and will want to eat.
I wouldn't worry too much.
My lo was really small too. Still is.
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She did fine with the switch over. She did it a bit later than most....at almost 5 months.
When they move to a 4 hour EASY they compensate by drinking more at the 4 day time feeds. It may take a few days for your lo to adjust but she'll be hungry enough to take a nice big feed and will on her own regulate her feeds.
Is your lo still taking 45 minute naps?
If so, I would really work on those A times....extending them.
Melissa