.................. is the first fluid released from a mother's mammary glands.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the first fluid released from a mother's mammary glands after childbirth.

2. **Identifying the Fluid**: The first fluid that is released from the mammary glands is known as colostrum.

3. **Characteristics of Colostrum**: Colostrum is a thick, yellowish fluid that is produced in small amounts during the first few days after delivery.

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