SHARON OEHLER: PEDIATRICIAN

One of a useful new series of seven—''Working Moms: A Portrait of Their Lives.'' (Others include a lawyer [Hispanic], music teacher [black], veterinarian, and park ranger.) Here, though causes for stress are evident, the picture is positive. Ever-cheerful ``Sharon,'' first seen at two a.m. attending a birth, gets home in time for two hours of sleep before joining her family for breakfast; Dad (an engineer who must often travel) cooks, and the three children accept responsibility without complaint. Sharon's day includes another tour in the hospital plus office visits, more time with the family, kitchen cleanup, and laundry. A few pages cover her training and reasons for choosing her career. There's a substantial amount of information here, well organized and appealingly presented. A generous number of b&w photos extend the text. Glossary. (Nonfiction. 8-10)