It could be true but...
I haven't tested this out yet, but I think the toddlers aren't random at all!
Hoshitchi & Hanepatchi = Good care
Belltchi & Mattaritchi = Bad care
To get good care you have to full up the whole friendship bar, and full all the shown rice bowls. And have no poops in the room.
To get bad care, you have to have a poop or more in the room. Have one or more shown rice bowls empty, and friendship bar not so full or empty.
I don't know if this is true..... but all my past Tamagotchis make this true.
I took bad care of my Pitchikutchi and ended up with a Hoshitchi, but all of my Patchikutchi's became Mattaritchi's when I neglected them (Letting the food bowls empty)