I spent the first 11 months at home with DS and he was generally very healthy during that time, a couple of colds and that was all. I have now been back at work for 2 months and he is almost constantly sick. Every week is a new viral/bacterial infection which affects his sleeping and appetite, etc. He is so miserable and we are all exhausted. I know it is because his immune system is weak because he is so little and suddenly exposed to a lot of germs. Can anyone give me an idea how long it will take for his immune system to get strong and more resilient to all these germs??