The toddlers are the preschoolers. As they learn their skills you can see them act older. You can also pay attention to the age in days for your kids. On normal lifespan, they are a kid for 14 days. What I do is use the clothing in CAS to make them look like a young kid. After 7 sim days, zi take them back into CAS abs use the clothing to make them look like a preteen. It is very simple to do. I do the same for the teen lifestage. They are teens for 21 days. The first 10 days the look like younger teens based on the clothing choices and possible braces on the teeth. On day 11, I take them back into CAS to make them look older with clothing choices and such. It is a simple way to get the effect of more lifestages that you want. So not, I do not think we need more lifestages in the game. I personally think that players just need to use their imagination and the tools in CAS to make the current lifestages in-game appear younger/older. Btw, I do the same tactic in CAS with the young adult stage since it is now 42 days long. I sometimes will do the tactic for the adult stage if I need to for storytelling purposes.