I am 3 months preganant and my 1year old just recently had the cocksakie virus can this virus be picked up by the new baby (fetus)?

Unlikely. During pregnancy your baby is protected by your immune system.When you were a kid, your past infections with this or other viruses gives you long term immunity which will protect the baby. If you get this one from your 1yo then baby may have some effect but the actual effect would not be known.Get a flu shot this season because you are likely not immune to that & it could hurt you & baby.