Is 'Let Me Know If You Need Anything' a Serious Offer?

lol so when people say "yeah just let me know if you need anything else" is that a serious offer or just something nice to say...lol because I have mostly everything for my son he just needs

-(1) more 0-3 snowsuit

-nb & 0-3 long sleeve onesies

- pack n play (even though I already have a bassinet & crib & bed cosleeper)