I have an old high chair which my aunty gave us when my first was born, it doesnt have straps so have always had problems keeping them sat in it once they were crawling, now i use a pair of rains and strap it to the underneath of the chair. as you only need it for 6 weeks it seems expensive to buy a new one, maybe your 2 year old will sit in the chair and use the table with some rains on. My little girl didnt like it at first but once she got used to it didnt mind, after a month we eased up on using them and she now only gets down to go to the toilet at meal times. She is also very proud of the fact she sits to the table like a big girl, like mummy and daddy do.