Those people upon whom Hajj is compulsory

Q: I have a question regarding the obligation of Hajj.

I am a convert to Islam.  I got married in 2013 and had a baby last year who is now 7 months old.  My husband and I would like further children insha Allah and as I am now 33 years old we would prefer to have another child as soon as possible. We are thinking about going for Hajj this year. My husband has already
performed Hajj in 2010 but I have not had the opportunity so far. I have a few concerns with regards our obligation to perform Hajj this year:

1. Our little baby will only just have turned one when we travel and as I am breastfeeding I would have to stop in order to perform Hajj.  I am worried about leaving him (he would stay with my husbands parents) but also realise that if we do not go this year, we may find it even more difficult in future years if Allah gives us more children.

2. If I do become pregnant prior to Hajj, is it permissible to postpone Hajj due to pregnancy and fear of causing harm to the unborn child.

3. I still have some outstanding student loan that I took out when I was at university before I accepted Islam. The repayments are linked to my income and taken out of my salary each month.  I believe that I still have a few thousand pounds outstanding and the loan does have a small amount of interest attached to it (linked to inflation). Hajj will be jointly funded by myself and my husband. I do not think that it will be possible to pay off the student loan and still have the funds available to go for Hajj. Would it be permissible to travel for Hajj with any of this loan outstanding?

Q:

1. I am adopted. Can I do hajj from my mother's money if its halaal? Will I be rewarded it's blessing and status, will my sins be wiped out? If I do it for the sake and will of Allah,  will the obligation of fard be full filled?
2. What if the money is interest based from a bank, will the fard obligation, rewards, blessings will be given fullfilled to the person doing hajj?
3. What if the money is of my worldly mother's brother's money (Halaal earned), can we do hajj from the money or my mother has to ask permission from her brother first?
4. Since I am adopted, my mother doing hajj alongside me, will her fard obligation be fullfilled? Will her blessings be given to her, wiping all the sins done in the past? Will it affect my hajj status and blessing?

Q: I will be embarking on Hajj this year, Insha Allah, and I want to find out what my correct Islamic duty is with regards to fulfilling long term debts. Do I have to pay the complete amount or ensure that the payments due within that period will be made?

Q: If a person has a huge debt to settle, is it permissible for him to go for hajj if he has a sponsor? The people that he owes have been waiting for a long time for their debts to be paid.