What do you do with money that friends or family give to you as a gift for baby? For example, money to celebrate their birth, first Christmas, or first birthday?

I feel kind of guilty but we put it in a savings account that we then use for bigger purchases: convertible car seats, stroller, bike trailer, etc. We have a limited budget so paying for items over $50 requires a couple months of saving.

I keep meaning to open him his own designated savings account or a 529 account but I just haven't gotten to the bank or done the research.

I also then struggle with what to write in the thank you card... I wonder if it's ok to say that we used the money to buy a big ticket item for him, or if people expect us to put it in a savings account for him when he is older.

When I was a baby, family gifted my parents savings bonds, and I cashed them in when I graduated to college to help pay for my moving out expenses.