How to build a human: Embryogenesis (embryo development)
Differentiation – the process that transforms once identical cells into different, specialized cells.
This infographic is by Eleanor Lutz, from Tabletopwhale.com
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This infographic is by Eleanor Lutz, from Tabletopwhale.com

Eleanor Lutz
http://tabletopwhale.com/faq.html
Another view of early embryogenesis
Learning Standards
Massachusetts 2006 Curriculum Frameworks
Life Science (Biology), Grades 6–8. Identify the general functions of the major systems of the human body (digestion, respiration, reproduction, circulation, excretion, protection from disease, and movement, control, and coordination) and describe ways that these systems interact with each other.
Massachusetts Comprehensive Health Curriculum Framework
PreK–12 STANDARD 4: Reproduction/Sexuality. Through the study of development students will 4.1 Identify the components, functions, and processes of the reproductive system. 4.11 Identify the stages of the male and female reproductive systems over the life cycle.
College Board Standards for Success in Science
Students understand that in multicellular organisms, the single cell (zygote) ultimately divides and differentiates into specialized cells that form the various tissues and organs of the organism.
Massachusetts Science Curriculum Framework 2016
Disciplinary Core Idea Progression Matrix