Hello
There's a document which was published in 2002 called: 'A better deal for tennants: your right to repair' - its on the internet if you search in google or something.
As far as I can see they should have it done in three days especially as you have a baby - and because it is a health and safety issue.
It says that you have to ask the council for definite times which are apparently set by law.
I think the best thing to do would be to call the council housing office and discuss it with them - but don't tell them that you've asked for any repairs doing - just ask them about it.
Hope this helps and it gets sorted out for you.
Abbie