First of all, hello from me and welcome to the forum. You really will have to contact your IP as you need to discuss what your options are before you make any decisions.
However, bankruptcy isn't as scary as it first seems.
As for your first question, providing you keep up with your mortgage and any secured loans you have against the property, the official receiver usually allow the bankrupt to live in the house for upto 12mths. This way, it should give you enough time to find alternative accomodation.
There will be form filling, presenting at the county court, paying £485 fees, being declared bankrupt by a judge and then having a meeting with the official receiver dealing with your case. You are usually discharged after 12 mths. If there is any disposable income you will be required to pay into an IPA or IPO for 3yrs. You may have to change your bank account but you may already have a basic account anyhow as you are in an IVA. This may all sound too much to take in so it is better if you take it one step at a time.
Try not to worry too much, you have your baby to think about and that is the most important thing.
You could have a look on here, it may clear things up a bit for you,
http://www.insolvency.gov.uk/
It's nice to be back......