The Vegetarian Resource Group has a very informative brochure titled Vegan Nutrition During Pregnancy and Childhood. The brochure cover topics such as Basic Needs for Infants (0-1 year); Feeding Vegan Children – Toddlers through School-Age; a Sample Meal Plan for Vegan Pregnancy; Feeding Schedule for Babies and Young Children; and Basic Needs in Pregnancy.
See: https://www.vrg.org/nutrition/vegan_pregnancy_brochure.pdf