Worried about autism, 13 month old

So my son is a healthy 13 month old. Lately, I have noticed that at times, I think when he is angry, hurt or tired, he starts making these humming sounds and blowing bubbles. He just stands there doing that and nothing I say stops him. He continues for a couple of minutes till he gets distracted or I start breastfeeding him to stop. I have been able to distract him and snap him out of it at times. He does that once in several days but has done in thrice since last night. Other than that he smiles, plays with toys, babbles, makes eye contact. He does bite when fighting over toys with his cousins. He even bites me at times. I am so worried...Please help!