No. Muslims believe that every child is born in a pure, natural state. Left to their own, children will grow up instinctively seeking the one true God, Allah. However, environmental influences and parents turn a child away from the pure, natural state. A saying of the prophet, on whom be peace and the blessings of God, confirms this. It says that each child is born in a natural state just as, for example a baby animal is born without any brand on its body; then the owner brands it with his own mark. Similarly, parents too would give a newborn their own religious identity (see Sahih al-Bukhari, Arabic-English, vol.8, no.597 and Sahib Muslim, Eng. Trans. vol 4, no. 6423).
The saying "every child of Adam is a sinner" means that every human being is a sinner, sin being an inevitable outcome of a fallible human nature. No matter how righteous a person is, he or she may at times disobey God through ignorance or forgetfulness. The prophet, on whom be peace, meant to emphasize that the best