I use Khitsule's Pointy Ears. These ears are touted for all ages. And they are inheritable. You have to first go into the detailed facial tool, and gently 'pull' on the tip of the ear to the desired look. I love it. Perfect for Vulcan ears. As you can see, Spock is in the teal and black jacket right behind the couple at the bar:
https://i.imgur.com/nQYnxg8.jpg
And these two toddlers were born with the ears:
https://i.imgur.com/8AoDTu9.jpg
If you have created an entire family in CAS and wish for the wee ones (not infants) to have pointy ears, you will have to first age them up to teen, place the ears and then age them back down.