hi! here's some kid/baby stories:
http://www.mangago.me/read-manga/the_youngest_princess/
http://www.mangago.me/read-manga/the_monster_duchess_and_contract_princess/?zP5C
http://www.mangago.me/read-manga/the_villainess_reverses_the_hourglass/
http://www.mangago.me/read-manga/i_am_a_child_of_this_house/
http://www.mangago.me/read-manga/they_say_i_was_born_a_king_s_daughter/?KZSf
^didn't like this, but it fits
http://www.mangago.me/read-manga/otome_game_no_hametsu_flag_shika_nai_akuyaku_reijou_ni_tensei_shite_shimatta/
http://www.mangago.me/read-manga/charlotte_has_five_disciples/?3tdn
http://www.mangago.me/read-manga/the_villainess_want_to_marry_a_commoner/
http://www.mangago.me/read-manga/please_throw_me_away/
http://www.mangago.me/read-manga/daughter_of_the_emperor/?f2hv
^didn't love it but again it fits
Thank you!
Something like “suddenly became a princess one day”, or “Ladybaby” where they start off as a kid