In humans, the outer layer of the blastocyst, called the trophoblast, secretes human chorionic gonadotrophin (hCG),human placental lactogen (HPL), and other hormones.
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Estrogen
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It's under hormonal control (which is mostly under brain
control).
An entire collection of hormones:
Progesterone
oestrogen
follicle stimulating hormone
luteinizing hormone
prolactin
oxytocin
Human placental lactogen
at least.
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A baby of one to three months should eat about four to six
ounces per feeding. Some babies with a larger appetite may want
more per feeding.