Figuring out exactly how far along you are isn’t hard if you’re counting weeks. But when trying to convert weeks to months and months to trimesters, it can get a little confusing. The chart above from babycenter.com helps to break it all down. Although, other resources have defined this a little differently, this resource seems to offer the only comprehensive way for me to understand it. So, this is what I’m going with.

At 16 weeks, I would assume that I’m 4 months along. However, not every month has only 4 weeks. So I’m actually at the end of my 3rd month and won’t reach 4 months until week 18.

Apparently, I’m a stickler for the details because this was really important for me to wrap my head around. 🙂 This also helped me understand how 42 weeks = 9 months. At first I thought 36 weeks = 9 months.

Hope this helps someone else understand! Be sure to check out the babycenter.com link for more explanation.