These chairs, great as they are, will benefit from some rocking chair cushions. A little added comfort on the back and the seat will make sitting in this type of chair more comfortable.
What type and style is a very personal choice some prefer the wooden back that could be used to massage an ache while others prefer a softer choice.
I had a rocking chair years ago and made a half padded back by covering a square of foam then tied it where the top frame dips using tie fasteners. No matter what type is decided upon it will be best to tie them in place with some sort of fastenings be it ribbon or a fabric strip with either velcro or press studs to hold it in place.
For ease the paddings shown here are ones that can be easily bought. Making your own will allow the cushion to fit the chair better. To do this make a pattern of the back to make the casing and then put the padding inside.
For me the best fit is the pillow and square cushion.
After deciding the design and style of the cushion, it is really now just making the covering.
These can be made with many of the different types of fastenings so the cover can be removed for washing, this may be a good option if the chair is in the nursery, or the cover can be slip stitched closed after making the cover but that would mean the whole cushion would need to be washed when the time came to do so.
I appreciate that not everyone would like to make the cushions so to give an option I will give an Amazon link to help with your decision.
Enjoy getting your rocking chair cushions.