I play with The Sims 2 Ultimate Collection ever since first release back in 2014, and I absolutely love it! It's my favorite game ever! Endless amounts of fun!!!
Anyway, I just found out that Toddlers can actually influence older Sims to do stuff. The Influence system is already a powerful feature in the Sims 2, so seeing a little baby influence an older Sim is quite intriguing!
I suppose this is how you can create a Super Toddler. The Toddler may be cute and all, but it can influence older Sims to do stuff, cheat on their spouses or make friends.