[Note: Oenone asks GRRM about whether Lysa's child was aborted or whether he survived.]
Lysa miscarried a child at Riverrun, yes.
As to whether the child was male... well, Lysa was convinced she was carrying a boy, at least.
Westeros.org is the premiere fansite for George R.R. Martin's A Song of Ice and Fire. Discuss the series on the forums and browse the fan-edited wiki. Read all about HBO's Game of Thrones, learn more about the books from our resource collections and play the MUSH.
New to the series? Read our spoiler-free review of A Game of Thrones.