Is my toddler displaying signs if autism?

My LB 17 months old is displaying some difficult behaviours that, to me, feel like more than your average toddler struggles. He has ALWAYS HATED and I mean HATED having his nappy changed and getting dressed is a struggle that seems harder than it should be. He can count to 10 and is getting to 20. He can identify and say shapes, colours and letters ( in his toddler speech). He struggles with emotional regulation when told no, like becomes Inconsolable and can be regulated most times with counting or pointing and things and naming them. He has 2 mums ( IVF baby) and seems to display these behaviours more with me than anyone else. So from family they are telling me it must be me, I feel like im adequately firm with him. He bangs his head and things on purpose. He's also started tiptoeing occasionally on one foot. I know alot of this can be due to his age but my gut feeling is telling me something isn't quite right. He makes eye contact and responds to his name. Any advice. Thanks.