YANBU
Sorry to hear you're struggling (and stressing) but there really is no need.
Money given by people for new babies, birthdays, Easter, Christmas and so on is always lovely. I genuinely think that most people that give money couldn't give two hoots what it is spent on as long as baby/child is looked after and loved.
When you have children, they cost money on a daily basis - toddler group donation or fees, treat in the supermarket, specific baby food or formula, trip to the park perhaps an ice cream or fruit shoot, swimming, tea and cake with another mum and baby, fuel for car to visit people etc
These things are not a specific gift or toy but are specific to having children (you wouldn't necessarily buy or do these things if you didn't have children) and socialising them into a society that makes them happy about being with other people and children.
Like another poster said, both my nans have always given (quite generous) amounts of money on occasions and are very much "spend as you need to bring up baby Godisadj"- bills food or gifts, whatever, they're not fussed as along as I'm happy and baby is looked after.
It might be different to how some people do it, but any money given goes in our account and DD gets what she needs, when she needs it. I keep a rough talley of what was given on her birthday but all in all she has plenty of clothes and plenty of toys - I don't need to buy her anything else for the sake of it just because she has some money to spend.
Going against the grain here, I wouldn't worry about replacing it in a month or two, that's just my relaxed view on it.