Speech Therapy - what age is best?

[Bugsy2]

Ex-H has just suggested that dd needs speech therapy. She is a very chatty 3 yr old who will be 4 at the end of April. She has a very slight lisp, which is improving as she gets older and I am not worried and her nursery are not concerned either.
I sent ex-H off to do his own research, and said that I didn't think it was something to be overly worried about. Should I be more concerned? Is there an optimum time for children to have speech therapy?

[poppiesinaline]

You could always get your HV or GP to check her and see what they think. DS1 had speech therapy at 4. My HV said it is just a good idea to get it sorted before they start reception.