It's probably more of a habit, really. He cries, you come, you snuggle and say good morning... sort of nice, especially if he has older siblings to compete with for attention during the day. Is he still in a crib? If so, a change of bed will probably lead to a change of habit. I wouldn't worry about the crying, though. If it bothers you, teach him to call out, "Mommy, mommy!" instead. 🙂
My son has kind of started doing this recently. It's not so much crying as it is just whining? I don't know. I'll go in his room and tell him hi good morning and he'll say it back but just whiney and like he might start crying.
Mine woke up crying last night and twice in the past 2-3 months ago. It’s so weird.
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My 2 1/2 year old started doing this as well. She was sleeping perfect then started developing some fears and separation anxiety. We adjusted her schedule a bit but still will wake up at least once between 4-6 am SCREAMING. It seems to be slowly getting better.