Question about Hauck alpha tray

I started using the alpha tray when my daughter was 8/9 months old. You can adjust the baby sitting space with the alpha tray, it has 3 levels. Still, I found this not so safe for a 6 month old. I was using the regular wooden tray for that age, there you can still use the safety belt. You cannot use the safety belt with the alpha tray. I hope this was helpful!