What is the clear liquid that my baby spits up?

The clear liquid that babies spit up is saliva and formula or breast milk, according to Children's Health Network. It is usually a bit of the contents of her stomach after a feeding.

Spitting up is called reflux or gastroesophageal reflux, notes Children's Health Network. Babies often spit up after they have been fed. It usually occurs with a burp, and it does not harm the baby or cause her to cry. The clear liquid is usually saliva, while a milky-white liquid is formula or breast milk. Spitting up is only a problem if the baby is spitting up often enough to interfere with nutrient intake and weight gain.