Hi
Just joined up today, need some advice on my two girls. The main problem is with my youngest though. I am new to owning female cats, always had males in the past.
Shes 4 months old (roughly) and has started yelling and yelling and yelling.

Its every couple of weeks, for about a week and I am soon to go insane. I got 2 hours sleep last night.
I have done some research and heard that it is likely that shes gone into heat, which can happen at her age and can be quite frequent after then rather than the 2 or 3 times a year which I thought it was. Is this correct? Also for spaying, we were told that 6 months was the youngest age, so what can I do until then to stop her yelling?!!
Thank you!