These patterns are for use of a child carrying a doll or toy. They should never be used to actually carry a baby.
Sew Toot "The 'Mini' Doll Carrier" (paid pattern)
Baby Bonda Productions "Just like Mommy" Buckle Onbuhimo Doll Carrier (paid pattern)
Baby Bonda Productions Easy Sew Toy Doll Carrier (paid pattern)
Childhood Gear (free pattern)
The Shopping Mama Meh Dai Doll Carrier Tutorial
Ginger Snap Crafts Toddler Baby Doll Carrier
For a doll pouch sling, you can simply cut the bottom of a t-shirt off that fits your child (straight across at armpit level.) The child can wear it cross-body and tuck their dolls in the pouch.