Is there a 5 month sleep regression?

My son used to wake up just once or twice at night... about every four hours or so. He quilt be five months old on the 14th and lately he's been waking up about every 2 hours. I don't know if it's a sleep regression or if maybe he's uncomfortable with the temperature or maybe he's teething... is there a such thing as a 5 month sleep regression?

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