Do new born children lose weight within first week after birth?

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New born children are born with their weight that they gain in the mother's womb. But after coming out they are fed by breast milk by the mother for first 6 months. For the first three to four days enough breast milk is not formed in many cases. So baby dont get their enough milk. So weight is lost in the first 6 to 7 days and then the child gains weight.