Is 4 weeks old the same as a month old?

Lizbeth

My son was born the 9th, so he’s 4 weeks today ( 😭 stop growing 😭) but he won’t technically be a month until the 9th?? Is that how that works..? I’m just wondering because I have one of those cute mats that you take pictures of them on and you choose how old they are and I’m dying to use it. 😂😭 I’m a first time mom so please be gentle lol.