Digraphs can include a combination of consonants or vowels.
The combination 'ay' is a digraph.
A consonant blend is when two or more consonants are blended together, but each sound may be heard in the blend.
As mentioned earlier, you can choose not to teach these to your kid.
Having taught the sound represented by the 2 letters ‘ay’ your child can be taught to read the words in the following manner.
ay > lay > clay.
ay > lay > flay
ay > lay > play
ay > lay > slay
ay > ray > bray
ay > ray > fray
ay > ray > pray
ay > ray > tray
ay > day > today
Here is the lesson on YouTube.