I'm living in India.. Have few doubts.. 1. When is best time to put baby in high chair to give solid feeds..when baby is able to sit with support or when baby is able to sit without support for long? 2. Which is better..high chair or booster seat? 3. Till what age can high chair be used? 4. Does sitting on high chair cause strain to back of baby when baby is just starting to sit up with support? Few people told me that its causes strain to back and not to use till baby is 1 year old atleast.. 5. I'm in India..kindly recommend some nice products..high chairs and booster seats available at reasonable price.. 6. Any good brands for booster chair cum high chair combined? I came across few brands like fisher price that have high chair that can be assembled and used as booster chair and table..how good is it?