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.
An example of the current yield formula would be a bond that was issued at $1,000 that has an aggregate annual coupon of $100. The bond yield on this particular bond would be 10%. Suppose that the same bond is currently selling for $900 based on today's market rates.