The child's safety is priority.
You could also call a hotline to consult with someone.
National Sexual Assault hotline
1-800-656-4673
https://ohl.rainn.org/online/
Some resources here:
http://www.rainn.org/
Added:
Childhelp National Child Abuse Hotline (if there is suspected or imminent abuse)
1-800-422-4453
http://www.childhelp.org/pages/hotline-home
You could also call your local Child Welfare agency to talk to a social worker (anonymously) to see what may be done.
You could also call a hotline to consult with someone.
National Sexual Assault hotline
1-800-656-4673
https://ohl.rainn.org/online/
Some resources here:
http://www.rainn.org/
Added:
Childhelp National Child Abuse Hotline (if there is suspected or imminent abuse)
1-800-422-4453
http://www.childhelp.org/pages/hotline-home
You could also call your local Child Welfare agency to talk to a social worker (anonymously) to see what may be done.