Suck that bottom lip

Ellis starting doing the funniest thing last night. He was in his bath, something that he is mildly OK with as long as he can look at himself in the mirror, and he started sucking on his bottom lip when I did something he did not like, for exampe, washing his hair or scrubbing his ear. All day today he was sucking on his lip. It was pretty funny. When he saw me or when he was bored, he would make these loud smacking sounds with his lips. It really was very cute.