Niddah 5:2-3

Niddah 5:2

If a man was eating trumah when he realized that he was going to have an emission, he should grip his male member (to prevent the emission) and swallow the trumah. An emission conveys impurity to the one who experiences it regardless of its size – even like a mustard seed, or even smaller.

Niddah 5:3

An infant girl is susceptible to niddah impurity on the day of her birth; at ten days old, she is susceptible to zivah impurity. An infant boy on the day of his birth is susceptible to zivah, tzaraas and corpse impurity. He can obligate (his brother’s wife) in yibum and exempt (his father’s wife). He can qualify (his mother, a kohein’s widow) and disqualify (his mother, a kohein’s daughter) in eating trumah. He inherits property and transfers it to heirs. One who kills him is liable for murder, and his parents and other relatives must mourn him the same as one would a full-grown groom.