Welcome boxes

So ever since the day I found out I was pregnant I’ve had lots of ads and Facebook posts related to pregnancy pop up lol!!! Many links for “Free” Welcome boxes show up! I am only about 8 1/2 weeks along with my first, but want to be as prepared as can be!!! Im just wondering if anyone has ever used this, if they are just a scam... or if they are actually legit!! Thanks in advance💕💕💕