**You can gently influence her behavior at six months, but understanding and consistently following “don’t blow raspberries with food in your mouth” is too much to expect yet.** Babies learn from repetition and your responses; understanding a rule and controlling an impulse take further development. The [American Academy of Pediatrics](https://www.healthychildren.org/English/family-life/family-dynamics/communication-discipline/Pages/Disciplining-Your-Child.aspx) recommends modeling, positive language, and redirection for infants.

Blowing raspberries is a normal skill at this age—the [CDC lists it as a six-month communication milestone](https://www.cdc.gov/act-early/milestones-in-action/6-months.html). She’s also learning how food feels and how to move it around her mouth.

I’d keep your response calm and predictable:

- When she blows a raspberry, pause the spoon, clean up calmly, and give her a moment before offering another small bite.
- Keep your reaction low-key. A big laugh or dramatic response may make repeating it more interesting.
- You can use a gentle phrase such as “Time to eat,” while expecting that its meaning will develop through repetition.
- If she turns away, closes her mouth, or loses interest, let the feeding end. Follow her appetite; don’t withhold food as punishment.

The [NHS’s guidance on starting solids](https://www.nhs.uk/baby/weaning-and-feeding/babys-first-solid-foods/) emphasizes going at the baby’s pace and allowing time to learn.

**I wouldn’t make an issue of it.** A consistent, gentle response is reasonable, but expect some food spray while she practices. A washable bib and a mat under the high chair may be your most effective tools for now.