Having a father-in-law as a carpenter by profession all my three babies had always a brand new custom built 'baby tables and chairs'
Depending on their ages their grandpa would just measure accordingly or by his perfect estimation of that particular thing he would be building for his grand children. They were just just very lucky. Thank God for him! These chairs and tables are still very good so I had to hand them down to their baby cousins/relatives for them to use again.