I need your brains!!

My partner and I have been trying for our rainbow baby and I feel like we are getting closer to conceiving so I'm trying to round up ideas for announcements for him when we do conceive.

Now Im a childcare educator and teach some amazing 2-3 year old that are important to me and I want to involve my kids at work in the announcement and am coming to you guys for your ideas on how to have my kids announce to him that I'm pregnant (through a picture or video) for when I conceive.