Time allocation studies show that women in developing countries face severe time constraints. However, such studies give a less clear picture of the time women spend on health and child care in the home and utilization of health services because these are primarily sporadic, not daily, activities. Reporting time spent by women on illness or health care utilization as a daily average masks the true cost of periodically losing half of a day or more of work time. Almost no direct empirical data have been gathered on the time costs to women of breastfeeding, immunizations, ORT, or growth monitoring, nor on whether time costs are an important determinant of utilization of these technologies. Specific research designed around the introduction of child survival projects, plus the inclusion of appropriate measures in the evaluations of ongoing projects, could fill this gap. Even without further research, recognition of the time constraints faced by low-income mothers in conjunction with lessons learned from successful growth monitoring and immunization projects suggests that outreach efforts may be an important key to increasing utilization of child survival technologies.