Benchmark 6B
The Human Organism: Human Development
Grades 3-5, page 132

It takes about 9 months for a human embryo to develop. Embryos are nourished by the mother, so substances she takes in will affect how well or poorly the baby develops.

NSES Content Standard C 
Life Science: Life cycles of organisms
Grades K-4, page 129
Plants and animals have life cycles that include being born, developing into adults, reproducing, and eventually dying. The details of this life cycle are different for different organisms.