angel1231 is right!
How many days you have left before your visa expiration? You can submit your application as long your visa is valid but do submit it in the home office as soon as possible! Once they received your application you can stay in the UK legally.
Submit all the supporting documents you have with your application but you may have only a little chance of getting a extension visa if your supporting docs are not strong enough. So be prepared!
For getting you child a Philippine passport go to the Philippine Embassy's website http://www.philemb.org.uk/ to download an application or go to their office in London.
You must take an action ASAP or you will ended up being overstay.
If you have anymore questions just come back here in the forum anytime or visit your local Citizen Advice Bureau or contact the Philippine Embassy.
