It is normal for an infant of this age to have a decreased number or no stools for several days because they are going through a rapid growth phase where they are gaining weight.
They are only drinking fluids and not eating solid food so if the body needs it they are absorbing all the liquid food and there are no or very few stools. So what you are experiencing is normal.
They should still be urinating well.
You can still use Mylicon if the child is gassy.