My LO coming to 12weeks. She flips her head left n right continuously when sleeping. Why does she displays such behaviour? TIA

At 3-4 months, baby would have gained control over the movement of their head and the movement you described is pretty normal. It can be because baby is making the effort to stay awake, as many babies fight sleep, especially if there is noise or something that sounds interesting -- reckon it's nothing to worry about.

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