At approximately day 1

Thyroid hormone continues to influence development post-natally.

Duration: 2 weeks

Reference [PubMed Link]

Sadler TW. 2000. Susceptible periods during embryogenesis of the heart and endocrine glands. Environ Health Perspect 108 (suppl 3):555-561.

At approximately day 1

Adult structure of the adrenal gland is not attained until puberty.

Duration: 2 weeks

Reference [PubMed Link]

Sadler TW. 2000. Susceptible periods during embryogenesis of the heart and endocrine glands. Environ Health Perspect 108 (suppl 3):555-561.

At approximately day 1

The definitive cortex gives rise to the presumptive zona glomerulosa and zona faciculata, which are present at birth, and the zona reticularis, which develops by the third year of life. The suprarenal glands (fetal adrenals) are 10 to 20x larger than adult glands, compared to body weight, due to a large fetal cortex. The fetal cortex regresses after birth.

Reference

Moore KL, Persaud TVN. 1998. The Developing Human: Clinically Oriented Embryology. 6th ed. Philadelphia: WB Saunders Co.