New hair different texture?

NNEJ • 35 Yr old Mother of 2 girls and 2 boys 🥰💕💙

My son was born with very very curly hair ( and a lot of it!) and has only really lost some on the sides and the back. I noticed his new hair coming in is straight. Does this mean he will eventually end up with straight hair? Both my girls were born with curly hair but not anywhere near as curly as my sons hair and both ended up with straight hair. Here is a pic. As you can see he has tight curls so I didn’t think he would be like the girls and have straight hair.