The infant should be consistently gaining weight and growing. In newborns, a loss of more than 5 to 7 percent of birth weight warrants investigation. The use of IV fluids in labour tends to artificially increase the birth weight of the baby, and subsequently inflate the babys weight loss. Newborns should regain their birth weight by two weeks of age, and gain at least 150 g per week.If an infant is not showing these signs of growing well, other possible causes include:

Poor milk transfer due to tongue-tie, or cleft palate. Medical conditions in the infant, such as malabsorption of nutrients. Definition
A mother is considered to have low milk supply if she produces less breast milk than her infant requires. The term is used only after a mothers milk "comes in", which usually occurs around 30–40 hours after delivery of a full-term infant. Low milk supply is distinct from the scenario in which the mothers milk comes in later than normal but is thereafter produced in sufficient quantities; this is known as delayed onset of lactation (delayed lactogenesis II). Prevention
The first week after birth is a critical window for establishing milk supply. The Ten Steps of the Baby Friendly Hospital Initiative describe some maternity hospital practices that promote the development of a good milk supply, such as rooming in (allowing mothers and infants to remain together 24 hours a day) and having trained staff available to help mothers with breastfeeding. Supplemental formula or donor milk should be given only when medically necessary.
Brachygnathism, or colloquially parrot mouth, is the uneven alignment of the upper and lower teeth in animals. In serious cases, the upper teeth protrude beyond the lower teeth. Problem with parrot mouth occur if the molars at the back of the mouth are also uneven, resulting in large hooks forming on the upper molars and the rear of the lower back molars. Horses with parrot mouth often require dental treatment at least every six months to remove the hooks and maintain alignment.The equivalent conditions in humans are termed retrognathism or prognathism depending on whether the lower jaw is too far back or too far forward respectively. See also
Horse teeth
Horse conformation
Veterinary dentistry


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