LOL, yes, stupid friends you have!! I thought you'd made a mistake in the title and meant 'years' not months!
I'm a childminder with LOTS of toddlers on my books and all of these are under 3, several just months apart. It doesn't matter which of these mix, they all get on very well and they learn a lot from each other. When I started back after ds2 was born, I had the following ages at the same time and it was perfectly fine:
10 wks
8 months
17 months
18 months
4 years
5 years
You wouldn't believe how much ALL of them got from each other and still do. These children are now:
1.9 yrs
2.3 yrs
3.0 yrs
3.1 yrs
6 yrs
7 yrs
(with extra children in between, mainly around 1/2 years old)
They CONTINUE to get lots from each other. Whatever the mix I have now, it never ceases to amaze me how well they all get on, I love watching them all interact and the youngest are so good with their speach, communication etc etc. as they feed off each other and the younger ones learn a lot from the older ones.
Sorry, I've gone off on one there , I( just can't believe they have commented on a 5 month gap!!!
the following mix very regularly: