If youre really doing baby Pokmon specifically instead of just basic Pokmon I hope youre gonna use Elekid
Elekid, Magby, Smoochum, Budew, Bonsly.
Id swap Bonsly for a Huge Power Azurill personally. That way youll have all 3 starter types (technically Azurill isnt a water type but its evolutions are & it has a water-heavy movepool), plus Azurill is just a cooler Pokmon imo.
Azurill is weak as shit (even for a baby.) I tried using one in White 2 once and I ditched it before the third gym. Maybe if it were water type and got STAB on its water moves...