You'll likely see this change around 4 to 6 months, when your baby starts eating solid food. That being said, if you still notice your baby is gassy, continue with burping and other gas-relief techniques until you feel they are not needed.
If the bond is trading at par current yield equals coupon rate which in turn equals yield to maturity. If the bond is trading below par (trading at discount) yield to maturity is higher than current yield which is in turn higher than the coupon rate.
Bonds have four yields: coupon (the bond interest rate fixed at issuance), current (the bond interest rate as a percentage of the current price of the bond), and yield to maturity (an estimate of what an investor will receive if the bond is held to its maturity date).