This process of growth takes time, so be patient. When they get up to 6 or 7 add variety by doing them reversed. This teaches visualization. You say a sequence backwards and the child repeats it to you frontward. This activity is great to teach spelling.
Spelling requires visualization and processing.
You can do this with any word they can read. You ll have less need to reread information or have to hear it again. You ll respond faster, more accurately to real-life or academic problems. Give incentives like stickers, coins, stay up later than usual or tell Dad. An organized brain makes a world of difference, even infants.