Antilop Cushion

I bought the IKEA Antilop high chair for little {A} because I like the size and simplicity (and price!). But when I first put her in it, she wasn't sitting up super well yet and her head rubbed the back and she was not happy. So I found a free online pattern at BluDor, for a cushion for this chair. I used some leftover fabric I had to make this washable cushion. It's hot pink on the reverse side. Unfortunately the cushion pattern wasn't what I'm used to (no seam allowance, a little too short--perhaps because it's European and they do things differently than here). I cut my fabric larger, but still it came out a little small & short. I'm only telling you that so that if you decide to make one yourself, you are aware of needed adjustments.