Answer:
The head of the sperm contains the nucleus. The nucleus holds the DNA of the cell. The head also contains enzymes that help the sperm break through the cell membrane of an egg. The midpiece of the sperm is packed with mitochondria.
Explanation:
Well he could be teething, if hes 18 months, but it could be an abnormality in his muscles
Can u go 2 the address 2 find out?