My baby 'chatters' on my nipple?

Rose • Fiancée & Mommy

I'm combination feeding between breastfeeding and formula.

He doesn't have any problems but I've noticed that when he's on my nipple he chatters his gums like as if he has teeth and he's shivering?

Is this normal lol it freaks me out a bit. He's only 10 days old.

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