Mahou Sensei Negima has Negi's father Nagi going missing shortly after Negi was born. Given that Negi's mother also disappeared soon after his birth, it's highly probable that the two incidents are related.
Yeah, this trope is about a male character leaving a pregnantLove Interest. I don't think it counts if the child has already been born.
Removed the following bit:
Yeah, this trope is about a male character leaving a pregnant Love Interest. I don't think it counts if the child has already been born.
something