Dear G.,
Gosh that is really a long time and such unfortunate timing. I am so sorry you have to go through this! I also know what how awful it feels to have your sweet husband so far away. When I was pregnant my husband had to go to Africa and Thailand for work and I was soooo upset about it. I couldn't help imagining the worst. I'm pretty sure my hormones made it worse. I think it helps to plan lots of activities, even trips, with friends to help the days pass faster. Perhaps evening activities since for me, nights were the hardest.
You might consider having a friend or family member come stay with you, just to have the company (it can feel so strange to be at home without them there). My parents came and stayed with me during one of the trips, which definitely helped.
If possible, arrange to talk with him every night, even if just for a couple of minutes. Skype is an internet phone service that lets you talk for free if they have internet there. Or it may not be too pricey if you initiate the call from the U.S. Otherwise, at least an email here and there will help.
Finally, I don't know your sleeping situation but now that I have the baby I love having her sleep in bed with me, and definitely would do this if my husband was gone. I cried before and during his trips because I missed him so much, but in the end what really encouraged me was knowing that God loved my husband even more than I did, and was watching over him.
Hmmm...I guess all of these suggestions were for you, not baby! Sorry. For baby, if he misses daddy, have a photo album with photos of dad to look at every day. If you have videos with dad, let him watch those. If there's a special book that dad does with him, you can still do it with him. I don't know how much a sense of "time" toddlers have, so in some ways it may not be as hard on him as on you. If he gets excited and distracted with fun activities, it might just seem like one really long day!
Hang in there.