Grandparents want to save for grandchildren

Hello everyone, we became parents for the first time in May. We ourselves save mainly in ETFs; we have created a portfolio for our child where we will also save monthly in ETFs. We both don't think much of banking products in general (this is mainly due to bad advice in the past and the learning curve). Accordingly, we don't own any and don't know what's currently on the market. My mother has now suggested monthly for our child