Responses
Sadly I can't recommend a whole list, but the keyword "isekai" will give some results for you, that's the Japanese word for being reborn in another world but sometimes people stay adults while sometimes they are reborn as babies. This manga is one that fits your preference though https://www.mangago.zone/read-manga/the_youngest_princess/
Can someone give me a list when the main character is reincarnated as a baby? Thanks!