Milestones

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Hey Mama's, I have a quick question about milestones, what are 2/3 month milestones, my baby is about 7 months but technically a 2/3 month old, I've been looking it up online and honestly I'm just more confused now and my pediatrician says I shouldn't worry about that as I have bigger things on my plate 🙄 but what are your 2/3 month olds doing milestone wise?