
Image Source: TV Guide
April found out she was pregnant the morning she and Jackson signed divorce papers.

Image Source: TV Guide
She had kept the information to herself, not wanting to trap Jackson in this marriage he no longer wanted just because a baby is involved. They had already lost one child before – Samuel had been diagnosed with Osteogenesis Imperfecta in the womb and died, and a grieving April decided to get out of Seattle for a while (basically an entire year) and work in a warzone Jordan with Hunt, while Jackson was left to grieve on his own.
“You knew I was hurting! You just decided to pretend that you didn’t notice, because Jordan healed you. But to heal, I needed you!”
-Jackson
The couple tried marriage counselling (and a few hookups, resulting in the new baby), but eventually called it quits.

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above, Ben gives April an emergency c-section in Meredith’s kitchen during the season 12 finale
In an interview with Entertainment Weekly, creator and executive producer Shonda Rhimes states that Jackson and April will be figuring out “in a much lighter way, what it means to be uncoupled, to be divorced, and to have a kid, and how you do that? They’re going to really try to do this in a healthy way, and is that healthy way going to feel so healthy when they still have feelings for each other?”
The couple will join a slew of other co-parenters on primetime this fall, including Jane and Rafael on Jane the Virgin (season three premieres October 17, 2016 on the CW)

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And Mindy and Danny on The Mindy Project (back on Hulu October 4, 2016 for season five)

Image Source: InStyle
Welcome to Grey’s, Baby Avery!

Image Source: TV Guide