Phase 2 Study to Evaluate Safety, Pharmacokinetics, Immunogenicity and Pharmacodynamics/Efficacy of EDI200 in Male Infants With X-Linked Hypohidrotic Ectodermal Dysplasia (XLHED)

Inclusion Criteria: Subjects for study drug administration must meet all of the following criteria to be enrolled: 1. Male with genetic confirmation of an XLHED diagnosis. 2. Subject must be at least 48 hours age and no older than 14 days. 3. Subject will have reached term (defined as 37 weeks gestation or older) prior to receiving first dose study drug. 4. Written informed consent of both parents (if reasonably available) must be obtained for treatment of their XLHED-affected male infant. 5. Neither mother nor the XLHED-affected male infant known to have received an investigational study drug in the 9 months prior to study subject enrollment in this study. 6. No major medical issues that the PI considers a contraindication to participation. Siblings of subjects receiving study drug must meet all of the following criteria to be enrolled in the natural history sub-study (no age limit involved): 1. Provide written informed consent/assent. 2. A full or half-sibling of a study subject where the study subject has received at least one dose of study drug in the Phase 2 XLHED Neonate Study and has not yet completed the study. 3. No major medical issues that the investigator considers contraindications to participation. Exclusion Criteria: Subjects for study drug administration who meet any of the following criteria cannot be enrolled in this study: 1\. Medically significant postnatal complications or congenital anomalies outside of those considered to be associated with the diagnosis of XLHED. Siblings of subjects receiving study drug who meet any of the following criteria cannot be enrolled in the natural history sub-study: 1. Known hypersensitivity to pilocarpine or pilocarpine-like muscarinic agonists. 2. Known hypersensitivity to lidocaine or lidocaine-like agents. 3. Presence of pacemaker. 4. Subjects who are not able or are not willing to comply with the procedures of this protocol. 5. Subject has a condition, which in the opinion of the investigator would not allow for safe conduct of the study.