I just posted this earlier on another thread:
In the Eastern Churches, we believe that man inherited from Adam only his liability to death and corruption, infants have no sin to remit. It is awareness of death that causes the development of disordered passions, which impel all men to sin.
Baptism represents new life in Christ. When immersed in the font, we descend into the tomb with Christ, and we share in his death, which is the death of the old man. Rising from the font, we are reborn in Christ, have put on Christ, and thus have access to the doors of immortality. Sins are remitted, only to the extent that the catechumen has actual sin to remit. Children, being blameless, do not have any sins to remit, but any sins an adult has committed, die along with the old man.
Hope that makes sense.
ZP