- 20 days Apparent Heart Beat
- 21-35days The lung bud branching and forming into the two principal bronchi
- 28-35 days Limb buds apparent
- 35-42 days Differentiation of mouth,digits and dew claws
- 42-49 days Nostrils and Eyes apparent, Mammary buds in females; empty scrotal sac in males, Jugular vein barely visible through the pink skin
- 42-84 days The bronchial divisions were differentiated and their air conducting system became established, lined with seudostratified and/or single-walled columnar epithelium
- 49-56 days Eyelids Close, Ear Canal Opens, Membranous soft center in the top of the head
- 56-63 days Jugular vein, facial vein and scrotal vessels all visible; Nostrils open
- 70-77 days Hairs appear on eyelids
- 77-84 days Horn Pits Appear;Ear vein prominent, Hairs on eyelids and muzzle
- 84-91 days Hairs on forehead, Pigmentation around horn pits, For males testes palpable in scrotum
- 91-98 days Skin whitish and thicker, Jugular, facial and scrotal veins no longer visible, Ear vein visible, Hairs along top of the neck, Top of the head has hardened-Also Lung Development-The respiratory bronchioles developed quickly，the primitive alveoli had developed,the respiratory bronchioles and primitive alveoli were lined by cuboid cells
- 98-105 days Tooth Eruption. Hair around eyes and muzzle; Hairs on chest, Eyelids separated, Temporary teeth buds just appear
- 105-112 days Body sparsely covered with hair, except limbs Also-Lung development-The respiratory divisions developed dramatically, the lung assumed a more “aerated” appearance.
- 112-119 days Dense hairs cover body and limbs, Teeth buds prominent
- 119 days 1-3 Incisors barely erupted in females at birth, Incisors at gum line in males at birth
- 119-154 days The alveoli developed and differentiated into flattened (type Ⅰ cell) and cuboid (type Ⅱ cell) epithelial cells of the lung development-here the baby can breath on it’s own.
- Normal Live Birth- 145 to 155 days
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