Alright, lots of numbers incoming.
Let's start per month: 145365000/12 = 12113750
12,113,750 births per month
next up is per week
Use the years amount to get this, and divide by 52 because of 52 weeks per year.
145365000/52 = 2795480.7692307692307692
Approx. 2795481 births per week
per day
145365000/365 = 398260.273972602739726
About 398260 births per day
take 398260 for this next one
Per hour
398260/24 = 16594.1666666666666667
About 16594 births per hour
Per minute (use 16594)
16594/60 = 276.5666666666666667
About 277 births per minute.
Per second (use 277)
277/60 = 4.6166666666666667
about 5 births per second.
All numbers are rounded to whole numbers because you cannot have a partial birth.
Hope this helps!