- Sahih al-Bukhari, Volume 2, Book 23, Number 441
From the above hadith, we learn that every child is born on Islam. It is the parents responsibility to keep the child on Islam.
Being a parent of a newborn child is difficult within itself and it just gets harder as the child gets older. By keeping your children on the straight path, parents will be fulfilling their duty and will be rewarded greatly Insha Allah in this world and the hereafter.
Parenthood starts from the moment the mother of the child falls pregnant because it is from that stage that Allah has blessed the couple with a child. If parents want to give their children a good and Islamic up-bringing it would have to be from that stage. When a baby is developing in the womb of the mother by approximately 4 months the fetus can hear, obviously not as clear as we hear things but it is from this stage that as parents we begin to refrain our children from listening to those things that Allah and his messenger have abstained us from. We should read the Qur'aan and make our children enjoy listening to the words of Allah.
Majority of the toys and equipments that are available for babies contain nursery rhythms, which is music. At that age, our children will not be accountable for what they do so they will not be sinful for playing the music on their toys and rocking to the music. It will be us as the parents for providing them with such toys.
You might find that your child comes to a certain age where every continuous sound especially music causes them to rock or sway. Some babies begin to do this with every sound including the sound of the microwave turned on and vacuum cleaner. The sight maybe was very delightful and attractive but to stop them from rocking and swaying with the sound of music is our responsibility because that is teaching them right from wrong. At that age it is common to encourage the little innocent child to do certain actions and enjoy the sound and movement and at the same time adults all have a good laugh and not think that this all falls under teaching the child wrong. By discouraging the child a few times they will understand that it is wrong and eventually stop.