Instead of an either / or choice, imagine infant feeding as a continuum, with full breastfeeding at one end and full formula feeding opposite. (pearltrees.com)
She had her first full formula bottle at 10.5 months old without a problem. (babywisemom.com)
After experiencing issues breastfeeding my youngest daughter, Teddy, we quickly had to move onto mixed feeding, and then to full formula feeding around the three - month mark. (grassfed.com)