Alpha-fetoprotein (AFP) is a protein made by the yolk sac of a fetus. High levels in maternal blood can suggest potential genetic disorders such as spina bifida; low levels can indicate Down's syndrome.

A low sodium diet is a diet that includes no more than 1,500 to 2,400 mg of sodium per day.

Spermatogenesis is the process in which spermatozoa are produced from male primordial germ cells by way of mitosis and meiosis.

Here's a how to perform CPR for babies:

1. Check responsiveness.
2. Open the airway.
3. Check for breathing.
4. Perform 30 chest compressions with two fingers.
5. Give two gentle rescue breaths.
6. Repeat cycles of compressions and breaths.
7. Call emergency services for help.

Remember, proper training in infant CPR is essential for effective response in an emergency.