Lillian M. Beard, M.D, a Fellow of the American Academy of Pediatrics, is an associate clinical professor at the George Washington University School of Medicine and Health Sciences in Washington, D.C. She is a frequent guest expert and spokesperson on national television programs, discussing issues related to children's health. Dr. Beard practices pediatrics in Washington, D.C.

Q: I'm expecting my second child during the winter months. What's the best way to protect my newborn from catching everything his 2-year-old brother comes down with?

A: Congratulations on your planning for the arrival, care, and protection of your newest family member. For starters, breastfeeding is one of the best ways to boost your infant's essential primary immune factors, which will provide protection from many illnesses. With each feeding, your breast milk transfers your antibodies -- which are immune protective factors that your body has produced from the many years of your exposures to and experiences with illness -- to your baby.

If your 2-year-old son has obvious signs and symptoms of illness, try to provide a little distance between the two (though this may be easier said than done). Gently and repeatedly try to explain to big brother that for just a short period of time, he cannot kiss his new sibling's face. Beware if he is mouthing the baby's crib toys. Carefully and periodically clean them with sanitizing wet wipes.

Your frequent handwashing after caring for an ill big brother will add another factor of protection of the baby. However, despite your best efforts, there are still no guarantees that your new bundle of joy will remain free of all illness through the early months. Rest assured, your concern, planning and thoughtful vigilance will significantly increase your baby's opportunities for good health.