My 5 month old DS is also doing that. He does it especially when he is eating his cereal. Funny, I thought maybe he just did that sound from eating kind of like how people act when they like food. I wonder if it does have something to do with teething. Could be, but I thought it was more to do with him eating.
Same here. Our DD is 5 mons 2 wks and does the mm for a week or so now especially when she is bored. Sometimes she does mm when on the boob too. It's like she was having a conversation while sucking.
My LO does that a lot when she's tired and I've put her down for a nap but she can't fall asleep. She's also done that after trying solids, and I took it to mean she wasn't ready.
Re: Mmmm
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