Reference for Niddah 106:34

אין

ON THE FORTIETH DAY AFTER THE BIRTH OF A MALE<span class="x" onmousemove="('comment',' All discharges of blood from the eighth to the fortieth day after the birth of a male is regarded as clean and after that begins the menstruation period of seven days followed by the zibah one of eleven days. ');">²⁸</span>

Jastrow