Some healthcare professionals suggest you wait until the umbilical cord has fallen off and the circumcision site has healed (if you have a circumcised son) to give your baby a tub bath. Fill a plastic baby tub with two to three inches of water, and then place it at a convenient height. Never leave your baby unattended in the bath.
You can also put the tub inside the sink or wash your baby in the sink without a tub. Just line the bottom of the sink with a folded towel to keep your baby from slipping, and turn the faucet away from your baby. Before you start, gather everything you'll need and be sure the water is neither too hot nor too cold. To test the water, use your elbow or the inner side of your wrist.
Try singing songs and playing while you wash your baby. This will help make bath time fun and special for both of you.