Babies do burr burr (lip blowing raspberries) for a few adorable and very important reasons:, 1. They are exploring their mouth, Around 49 months, babies discover they can control their Baby sticking tongue out: Causes and what to do Does Your Baby Have The Tongue Thrust? Amazon.com : ETETOO Vibrating Teether for Baby Sensory Chew Toy for Autistic Children & Vibrating Chewy, 10X Vibration Settings, Giving Autistic Children a Better Sensory Experience (Pink) : Baby What Should your Baby's Tongue and Jaw Do? Genuine Lactation