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I think you might be looking for Dungeon Nursery.
http://www.mangago.zone/read-manga/dungeon_nursery/
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Does anybody know the name of the manga where there was this mc who always summons a baby monster? And every time he levels up a monster, he gets a chance to summon a new monster on a different level but he still gets a baby monster. It had about 12 chapters when I started it but didn’t finish and now I’m craving it