Chrissy tweets about struggling to produce enough breast milk for her kids

American model Chrissy Teigen took to Twitter and wrote about struggling to produce enough breast milk for her kids. "I remember pumping my A** OFF...because I didn't trust milk was going into their mouths...It drove me mad to the point I could only get an ounce," she said. "'Normalize breastfeeding' is great. 'Normalize formula' is great, too!" she further said.