Try applying the leave in conditioner to dripping wet not damp or towel dried hair and do not brush. There are various tutorials on YouTube on the Curly Girl method as applied to little ones.
There are many curly kids ranges - CURLS CurlyQ's and It's a Curl, Ouidad Krly Kids, Kinky Curly Tiny Twirls, Mixed Chicks Kids for example. The CURLS line is supposed to be organic/ natural and is available in Target and Walmart.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
Treatments: Komaza protein, Komaza Matani, coconut oil with sugar syrup. Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume
Styler: Umberto Giannini jelly, Boots curl creme, Rockin RInglets
Experimenting with: Mega-Tek, Curl Harmony reviver, Elvive Full Restore 5.