Im suspecting my first baby (17months old) to have Hand, Foot and Mouth Disease because of his symptoms. Im worried that my second baby (7weeks old) would also get infected since we are all co-sleeping. We are practicing strict hand hygiene, especially on this time. But how would I ensure that my infant will not be able to get the virus? TIA

Very importantly is to separate both of them. They can't sleep in the same room. Whether or not you have seen a doctor to verify, separate them 1st. Avoid any unnecessary virus/germs to be transmitted to your 7 weeks old infant. Hand hygiene is especially important during these crucial period. Do also get it checked and verified by the doctor fast.