Board Thread:Wiki-Related Discussion/@comment-4975807-20180520221943/@comment-6302057-20180525134655

Presuming that Hope's birth is approximately 9 months in LWM-time after Emma meeting Henry in 7x02 (she was not showing, so very early on), my estimation is she was born not long after the start of the Sixth Curse. She's still infant-sized in 7x22, so she's presumably no more than 12 months old.

Taking into account 9 months pregnancy and Hope's limited growth, at most 1.5-2 years passed between Emma pregnant in 7x02 and baby Hope in 7x22.