You can apply for Child Benefit which will not affect your application at all. However you must check with the Child Benefit Office to see if you are eligible. If you receive it and turn out to be not eligible then you will have a problem.
Receiving other benefits depends on at what capacity you are in the UK. If you are holding a work permit then you are not allowed to receive any benefits and neither do your wife. It is very unlikely that you will be allowed to receive any benefits before an ILR application.
E Fidan
Administrator