We've been through this so many times, there should be a sticky.

Ellone tells Squall how while Laguna was away, Raine had their child, but died soon after, and Ellone and the child were sent to Edea's orphanage. considering Squall's attachment to Ellone, it's likely that it was him. Plus I think Kiros tells Squall in Esthar he looks like his mom, and mentions it's a good thing he doesn't look like his dad. something like that. Also, Laguna has Squall's card.