Hi K.,
Are you planning to buy a bulk of your baby items and have them shipped to South Africa?
Here are my suggestions:
1. short sleeve and long sleeve onesies (I don't know how much your baby weighs but my daughter is in the 75th percentile and I've always had to buy clothes that are at least 6 months larger.) There is a Carters in Colma (next to Target) that sell packs of onesies for a reasonable price.
2. light weight and thicker outfits to suit whatever weather you might encounter (various sizes)
3. sippy cups, training utensils, bowls, and plates (this is a really great set: http://www.toysrus.com/product/index.jsp?productId=2729190) I bought several "expensive" sippy cups and my daughter didn't even bother with it.
4. snack traps (to help them learn to feed themselves) http://www.toysrus.com/product/index.jsp?productId=3502507
5. booster seat (I chose to buy a booster seat instead of high chair to save space. Plus you can bring the booster seat to restaurants or friend's home.)
http://www.toysrus.com/product/index.jsp?productId=2861764
6. books and toys (for the plane ride and for your new home)
7. light weight and fleece sleep saks, various sizes
8. hat, sunscreen
I don't know exactly where you're moving to but another option is to order online. Good luck with your move. Take care!