Chapter 642 – Losing Face [Read it here…]
Usopp’s father ditched him, Luffy’s father ditched him, Ace’s father ditched him, Robin and Nami don’t even know their fathers, Makino’s baby’s father ditched them, etc etc. I’m starting to think Oda is hinting at something about his past…
Oda confirmed in the Volume 63 SBS two months ago that the baby Makino is holding is indeed, hers. I’m sure we can all guess who the father is.
—The One Piece Guide