Many parents do not realize that breast fed infants and formula fed infants have different growth patterns. The breast fed babe tends to grow quicker during the first four months of life than the formula fed babe. At around four months, many breast fed babies' growth tends to slow leaving parents feeling as though something is wrong or that moms milk is inadequate. They then choose to supplement or introduce solids on recommendation of their pediatrician. Unfortunately, many pediatricians are also unaware of the difference in growth. One of the most commonly used infant growth charts was created decades ago and used formula fed babies to come up with the standard growth. Because of this, many breast fed babies look as though they are dropping off from their growth curve when their growth is actually physiologically normal. The World Health Organization (WHO) released a revised growth chart in 2006 which uses breast fed babies as the standard. Many pediatricians still do not use this revised chart so many parents are told that their infant has inadequate growth. If you have had a similar experience, ask your pediatrician which growth chart they have been tracking your child's growth on. A link to the WHO charts can be found here: http://www.who.int/childgrowth/standards/en/