Actually people, I decided to test this today while playing Eden SP 2 and Plymouth SP 2
Both time's, I got more children and more workers when having two nurserys and two universatys
I had over 500-600 population between the 1000-1300 marks
vs 300-400 population between the 1400-2000 mark with just ONE Nur and ONE Uni
But, I think it does very, cause when I was playing the population one. It didn't matter at all how many nur's and uni's I had, my populations child rate remained the same as if I had only one nur
But, then again, it could be because I'm a very fast builder and have a mind for micro-managing (shrugs) who knows