4 month old whining

My 4 month old son has started to sound whiny like he is frustrated and whinging but he doesn’t cry at all. He doesn’t look like he’s in pain and he eats sleeps well. It’s just like he is mad and his face frowns and he squints his eyebrows and the sounds he makes is like when a dog whines/cries.

Anyone know what this is please? Thanks

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