do british citizens require visa to enter USA and why? This wasnt in place before?

Normally they do not, they can visit up to 90 days for business or tourism without a Visa, but they MUST register for a travel authorization and meet certain other requirements, such as having a machine readable passport and/or biometric passport (depending on date of issue).

Here is the info about the Visa Waiver Program

http://www.usimmigrationsupport.org/visa_waiver.ht...

ANd about ESTA registration before they leave the UK

http://www.usimmigrationsupport.org/esta.html

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RE:

do british citizens require visa to enter USA and why? This wasnt in place before?

My brother had to get a Visa to visit for 21 days last year, so whoever is giving out the answer of no here is incorrect

Visa is not required if you are staying in US under 90 days. British is part of US Visa Waiver Program.

http://travel.state.gov/visa/temp/without/without_...

Me and my wife are US Legal Permanent Residents ( we hold Green Card). However our new born baby is UK Citizen as he was born in London.

Can any one tell me if I can travel to USA. How long we all can stay together in US.

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No you don't. So long as you're a permanent resident of the UK, and obviously your passport will be valid. Hope you have a great trip!

Not unless you committed a crime or something, no.