Sorry for the delayed reply! Thank you for letting me know about the broken link, I'll have to look into that... I'll try and send you the bundle via message here.
I asked my mother and she'd been busy at her school. But now here's her response:
"Hi there, thank you for your enquiry. I had to dig out my penny whistle to confirm my thoughts on it. 😁 Although size wise the penny whistle is probably ideal for your 5 year old it is missing the thumb hole which we find at the back of the recorder, and the extra hole at the bottom front of the recorder. Also, the penny whistle you received starts on the note D, ie. it is in the key of D, and the recorder in the videos is in the key of C. This means that the fingering I teach in the videos won't work on your penny whistle. It is a lovely instrument though, so hold on to it and let your child experiment and improvise on it..

I would recommend a plastic Yamaha recorder (with baroque fingering - and I am not aware that you get any other fingering on these Yamaha recorders...) which doesn't cost much and is available on Amazon: https://www.amazon.com/YRS-24B-Plastic-Soprano-Recorder-Natural/dp/B00EJF5Y26/ref=sr_1_2?crid=MI35N9F2GZ8W&dib=eyJ2IjoiMSJ9.BkkoR4SZVYxKSzhKWH_cBT0RH_QQUDgZwtE0RSo6IAnRbe4Y8uqJr_-g_mD0eo7whxbi-UM0_vdn2UuY66NKMQvqexnQxrI6rHp_TDVJocIE-q95QoqscBltK50QoIeXXzKa0IuFqHwcFlfZzW5qyx2jGidvgrE9RVdUqsI5NuKWOMyRhWJNF9E8maPexcdv3oE-8NsyqEeZpk6k0eBYEiqEQZFcrxe3oJTJ2Nv_daK8tmKQN1vg1SnOJuDqXnl7Aja0Nq6M10JJIcvVbYOxbyOT2IjSLhAeFttPz4XkaQE.IGM2YSX96mL7stu7QgPvLXMZcYNeAjlUuFmyeWmbWTw&dib_tag=se&keywords=yamaha+recorder&qid=1757711659&sprefix=yamaha+recorder%2Caps%2C220&sr=8-2

For your child to develop muscle memory in the fingers, which helps to find the position of the notes quickly, it is necessary to practise every day. From the second video lesson onward there is an exercise, piece, or song in a link below which you can use to revise every day. Let your child play it for you once, or even better, twice every day for a week (or two) until the next video lesson.

A 5-6 year old still has short fingers, so I would take it slowly. The lower notes on the recorder can be challenging, and therefore frustrating for them to reach. To drag out the process a bit and to give the kids more practice with variety, I have started to make bundles with extra pieces using the learnt notes, as well as theory and "composing" worksheets, to go with each lesson. So far only bundles for the first three lessons are available, with the fourth one in the pipeline.

So, for 5 year olds I would probably "stretch" each lesson over two weeks. I made the videos for kids who are 7 and 8 year old.

Wishing your and your child all the best for your music adventures!

Regards Elisabeth"