How to duplicate each row of a matrix N times Numpy

I have a matrix with these dimensions (150,2) and I want to duplicate each row N times. I show what I mean with an example.

Input:

a = [[2, 3], [5, 6], [7, 9]]

suppose N= 3, I want this output:

[[2 3] [2 3] [2 3] [5 6] [5 6] [5 6] [7 9] [7 9] [7 9]]

Thank you.