My baby did same thing but during naps. I made sure she practice all day her crawling and standing and sitting and still does throw tantrums and screams during naps. She stands in her crib for about 15mins sometimes tries to sleep standing up by laying her head in the corner of the crib. How funny but she does that and get upset when she wakes up from a fall. Hahaha May be babies really go through with some regression but we need to be consistent with our routine I guess. :)
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