Pures at 5 months then BLW when ready?

Mayra • Married to the love of my life 💍, mom to a beautiful girl 👨‍👩‍👧

My pediatrician told me that there is research suggesting that it is good for babies to start with solids at 4 months, so I wanted to introduce pures to my baby now, but I want to do BLW when she shows the signs which I’ve red Can happen at around 6-7 months.

Has anyone ever done pures then switch to BLW when baby sits unassisted?

Is there a downside? Should I just wait and do only BLW?