Answer
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
No, converts to Islam do not get baptized. Instead, they take a full-body shower called ghusl to cleanse themselves, then perform wudu (ritual washing), and finally say the Shahadah—the declaration that there is no god but Allah and that Muhammad is His messenger—to officially become Muslim.
Answering your question, Dr. Jasser Auda, Professor and Al-Shatibi Chair of Maqasid Studies at the International Peace College South Africa, states:
Basics of Converting to Islam
To convert to Islam, all you need to do is say “I bear witness there is no God but One and Muhammad is His Messenger.”
You have to believe in all the Messengers that Allah has sent.
You have to believe in all the Books that Allah has revealed.
You have to believe in the Angels.
You have to believe in the Hereafter. That is people will be held accountable for what they did in this life.
Finally, you have to believe that Allah destined everything.
Should New Muslims Get Baptized?
There is no particular baptizing ritual in Islam except for one that appeared in the Sunnah of Prophet Muhammad which is when you convert to Islam you take a bath.
That bath is a sign of ritual purity after which you can pray and you can continue your life as a Muslim normally.
For males, it is recommended to do circumcision. This applies if the person who is going to convert to Islam is of a younger age and if it is something that will not have a negative medical impact on the person.
If the doctor says it is not a good idea to do circumcision, then there is no need for circumcision.
The basic ritual of converting to Islam is for the heart to turn to Allah and dedicate one’s life to Allah the Almighty.
Almighty Allah knows best.