looking for that too
there's I'll Be The Matriarch In This Life - https://www.mangago.me/read-manga/i_ll_be_the_matriarch_in_this_life/
Action:
https://www.mangago.me/read-manga/doctor_s_rebirth/
https://www.mangago.me/read-manga/poison_dragon_the_legend_of_an_asura/
Favorite kid MC manga of mine:
https://www.mangago.me/read-manga/mairimashita_iruma_kun/ (not reborn but has kid MC?)
Shoujo:
https://www.mangago.me/read-manga/lady_baby/
https://www.mangago.me/read-manga/suddenly_became_a_princess_one_day/
https://www.mangago.me/read-manga/lady_baby/
https://www.mangago.me/read-manga/suddenly_became_a_princess_one_day/
https://www.mangago.me/read-manga/the_twin_siblings_new_life/
https://www.mangago.me/read-manga/the_youngest_princess/
https://www.mangago.me/read-manga/i_am_a_child_of_this_house/
https://www.mangago.me/read-manga/the_precious_sister_of_the_villainous_grand_duke/
https://www.mangago.me/read-manga/i_was_just_an_ordinary_lady/
https://www.mangago.me/read-manga/tensei_shichattayo_iya_gomen/
https://www.mangago.me/read-manga/the_beginning_after_the_end/
Mangas where it starts off with the mc as a baby/kid and shows them growing up. Mostly looking for reincarnated or rebirth ones but it doesn't have to be