OK, I see a little more grey assuming *you* truly want a baby and there are compelling reasons for not waiting a year or two. Really it would be ideal to wait a year or two.
One of my dreams is to have 3 kids an like sri624 I am almost 40, had a miscarriage right at D-day, and am out of time. I am doing a lot of soul searching very quickly right now! Basically, in my view given all the uncertainties of R, I need to be ready to support in my case three children on my own in every way. Financially. Emotionally. I have had a heart to heart with my accountant, am pursuing a raise at my job, have talked with my single mom colleagues who have used au pairs, am trying to buy a very affordable house walking distance to an elementary. I need to be able to provide a high quality, great childhood for my kids primarily on my own (I think I can rely on my H taking them one weekend day per week which I could devote to household work). With alot of resources at my disposal, I am still worried about being emotionally able to provide for three as a full time working single parent.
If you are truly prepared to be a single parent of multiple children, then I think is an option, though I agree with PPs not the ideal one.