I cannot keep socks on my baby.  They either fall off or she pulls them off.  I looked high and low for pants with feet for a child 6 months and older.  I couldn't find any.  Once a baby is over 3 months, it seems like you can only get PJs with feet.  So, I bought these.  They were expensive, but they solved my sock problem.  She can crawl all around the house and her little toes stay warm.  Plus, they are super soft.