| Name | Info | Provider | Link |
|---|---|---|---|
| Twins, Triplets, Multiple Births | free resource | MedlinePlus Health Information | https://medlineplus.gov/twinstripletsmultiplebirths.html |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=34665470.ui | |
| free resource | Wiley | https://doi.org/10.1111/bcp.15111 |