I do not have a specific tool to share, nor are we in a place to consult with you to develop one. I recommend that you contact someone in a local college or university that focuses on maternal and child health. They can be a great resource that can help you and your organization in the long term.
That said, the resources with the CTB Assessing Community Needs and Resources (/en/table-of-contents/assessment/assessing-community-n...) might be all you need to complete this work yourself. Check out Section 1 -- Developing a Plan, Section 7 -- Developing Needs Assessment Surveys, and some of the other related materials within that chapter to aid in the process.
