Gwen Stefani and Blake Shelton desperately want a baby girl, and have started talking about adoption!

Sources reveal exclusively to Life & Style that the country crooner and No Doubt rocker planned on trying IVF to start a family, but are open to adopting if that doesn't work.

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"It might be a baby, or it might be a toddler. But no matter what, they want to have a little girl in their arms by the end of 2017," a source shares.

gwen stefani blake shelton splash

And Blake has already gotten some hands-on training, enjoying time with Gwen and her three sons, Kingston, 10, Zuma, 8 and two-year-old Apollo, at Disneyland last week.

MORE: Gwen Stefani and Blake Shelton Spend the Day Together on His Ranch — See the Cute Pics!

"Gwen loves that Blake is such a family man,” adds another insider. “Seeing him with her kids just makes her fall in love with him even more!”

For more exclusive celebrity news, pick up the latest issue of Life & Style, on newsstands now! And check out more photos from the couple's recent outing in the gallery below.