(HealthDayNews) — Newborns are susceptible to infections, especially during the first seven days of life.

Symptoms of illness can include vomiting, diarrhea, and cough. However, sometimes the signs are more subtle, says the San Diego Children’s Hospital. For instance, your baby may be:

• Sleeping excessively.
• Exhibiting seo tips a sudden change in feeding behavior.
• Unable to sustain sucking or nursing.
• Sweating during feedings.
• Moving around less.

If you suspect that your infant’s appearance or behavior has become abnormal, call your doctor immediately.