Say what the permission covers
Sending a photograph to a relative can mean 'I want you to see this', not 'please share it with everyone you know'. Explain that distinction directly. You can allow saving a picture privately while asking that it not be forwarded, posted, printed for others or used as a profile image.
Agree with other parents or guardians involved before sending a wider message. Different assumptions inside the household are harder to manage after relatives have already received conflicting instructions. Choose a rule you can state in one or two clear sentences.
For example: 'We are sharing these pictures privately. Please ask us before posting or forwarding any of them.' If you want no public images at all, say that rather than leaving relatives to guess which photographs are acceptable.
Review the whole image
Before sending a photo, look beyond the baby's face. A document, address label, hospital wristband or another child may be visible. Decide whether the image shares information you intended to keep private. Ask the people pictured before circulating their image where appropriate, and respect facility rules about photographs taken there.
Private groups and shared albums still involve other people receiving files. Choose recipients deliberately and explain whether they can add others. Do not assume a privacy setting prevents someone from making another copy.
Respond to a mistake with a precise request
If a relative posts something against your wishes, identify the image and ask them to remove it. Tell them which rule applies without sending more private details to justify the request. You can decide separately whether you want to discuss the broader relationship issue.
If the same problem continues, change what you share with that person. You might send occasional approved images or use another way to include them. A boundary is easier to maintain when it changes your own sharing decisions as well as asking someone else to behave differently.
Revisit the arrangement as your child grows and becomes able to express preferences. For now, keep the initial rule clear, consistent and easy for relatives to check before they press send.
