Katekyo Hitman Reborn!, Beelzebub Recommendations
Both start with the main character meeting a baby with strange powers. Also, both start as a comedy manga, but quickly evolve to a more action oriented one.
Protagonist are a baby and a student, and the baby has the ability to give supernatural powers to the protagonist. Both involve fights between confronted factions between heirs, the heirs of a mafia gang in Reborn and the heirs of Satan in Beelzebub. Both use the shounen technique of "the enemies of today are the allies of tomorrow".
Both manga are shounen with 150+ chapters involving students forced to take a big roles they dont want, I get a similar feel from the both of them