Brief Answer- No, usually the infection doesnt pass on and harm the baby. Detailed Answer- Hello Dear Thanks for your query, I will be most happy if I could help you out so no need to worry much. Signs and symptoms of an abscessed tooth - pain on biting. - swelling or lump on gums may be associated. - facial swelling may be there - fever or chills may be present - pus drainage - tender on touch or palpation It is not essential that all patients will experience all the above signs and symptoms. • I will advice you to get an appointment with a dentist as early as possible so that he/she can do thorough clinical examination and will take the radiograph (X ray) to confirm the diagnosis and start the needful treatment (Procedure+Medication). • In your case, it is very much possible that Root Canal Treatment of the offending tooth will solve out the problem. Hope this will help you. If there is any more query or question regarding this in your mind, you are free to ask me any time. Take Care Regards