[rdl]

How many females were on the recruiting team? (i.e., how statistically significant was all of them getting pregnant in the same month...)?

[Tichy]

Pregnancy is probably infectious.

Also having landed a job at a company that is doing well is a high risk factor for pregnancy.

[rdl]

I remember Google advertising themselves as family friendly in the mid 2000s as a recruiting strategy; I guess if people are coming back after even 6 months out, it could be a worthwhile strategy.