Nausea is the sensation of impending emesis and is frequently accompanied by autonomic changes, such as increased heart rate and salivation. Nausea and vomiting typically occur in sequence; however, they can occur separately (eg, vomiting can occur without preceding nausea as a result of increased intracranial pressure).
Vomiting is uncomfortable and can cause dehydration because fluid is lost and because the ability to rehydrate by drinking is limited.

Vomiting is the final part of a sequence of events coordinated by the emetic center located in the medulla. The emetic center can be activated by afferent neural pathways from digestive (eg, pharynx, stomach, small bowel) and nondigestive (eg, heart, testes) organs, the chemoreceptor trigger zone located in the area postrema on the floor of the 4th ventricle (containing dopamine and serotonin receptors), and other CNS centers (eg, brain stem, vestibular system).

The causes of vomiting vary with age and range from relatively benign to potentially life threatening. Vomiting is a protective mechanism that provides a means to expel potential toxins; however, it can also indicate serious disease (eg, intestinal obstruction). Bilious vomiting indicates a high intestinal obstruction and, especially in an infant, requires immediate evaluation.

Treatment Options
-- Feed the baby with easily-digestible food. Divide the food into small portions and then feed.

-- The baby should be well-hydrated, hence make sure that you feed him/her with enough fluids. Also, allow the baby to take adequate rest.

-- Take proper care to keep your baby away from any kind of disorder. If the infant is vomiting continuously after eating any kind of food, then it is a serious matter, therefore, opt for an appropriate treatment at the earliest.

-- Also, if you observe blood or bile in the vomit, then it is a matter of concern. Since a baby's digestive system is weak, do not feed him/her with spicy food. It is better to avoid fried foods as well.

The problem of puking in infants should be treated as early as possible, as it might affect the baby's health. Due to vomiting, the baby will not be able to gain enough weight. Also, since the ingested food is coming out, the baby is deprived of nutrients required for proper growth and development. Puking also leaves the infant irritated and since he/she lacks the energy, there will be very little interest to either work or play. Seek the advice of a pediatrician to know what to feed and what not to feed the baby.