Theoretically your W-2 should split this out for you (and TurboTax). You should have two lines in the State section; Box 15 - NJ, Box 16- Wages earned in NJ, Box 17-Tax paid to NJ. Second line, Box 15 - NY, Box 16 - Wages earned in NY, Box 17 - Tax paid to NY.
If 75% of the wages reported on your W-2 were earned in the NJ period, and 25% during the NY period (plus income from parental leave, which replaces wages), that sounds like an accurate allocation of income between the two states.
Click this link for more info on How to File a Non-Resident State Return.
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