Baby is probably soothing self to sleep. My LO does that too but now at 3.5 mths, i noticed she doesnt shake her head as much as before. Now she suckles on her fist to soothe herself to sleep..
Each kid having different habits , may b she falls sleep easily while she do so, coz I do so to my kid head shake while making him sleep when he is small then he sleeps faster ..
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