Many parents find success with bottles designed to mimic the natural breast, such as Philips Avent, Comotomo, or Dr. Brown’s. If your baby is fussy, you may need to experiment to see which nipple shape or flow rate they prefer. If you are using plastic bottles, monitor them for scratches or yellowing and replace them every 4–6 months, while glass bottles can last longer as long as they are free of chips or cracks.