When your at DD's child care next tell them that if she walks there they are not to tell you. That way when your at home and you see her walk it will be the first time and you will still get the full surprise. I did this when I was enrolling my DD1, luckily she walked before she started but I did the same for DD2.

Just think by working now your preparing yourself to have time off when your next bubs come and you will be able to enjoy them together.