Three kids under three and a nationally televised dancing competition to film? Jen Affleck has her plate full.

The “Secret Lives of Mormon Wives” star is just nine weeks postpartum and gearing up for her “Dancing With the Stars” debut — so while some things remained the same as when she had her first two babies, others were a bit different this time around.

The 26-year-old shared her pregnancy must-haves with The Post, plus the way Zach is making sure she gets more rest since giving birth to their third. 4

Jen’s must-have No. 1: self-care

Jen shocked fans when she pulled out of filming “The Secret Lives of Mormon Wives” partway through Season 2 — but she says that during her pregnancy, it was important to prioritize “taking time for myself.”

That included exercise but also rest

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