Reason #1 – Taking in more air
First, the pregnancy puts greater demands on your body, and one of the ways that your body accommodates these increased demands is by increasing the amount of air taken in with each breath. On average, a woman inhales 30 to 40% more air with each breath while she is pregnant as compared to the way she breathes the rest of the time. This brings more oxygen into your body and allows your body to function more efficiently, but it also may result in hiccups as you adjust to new breathing patterns.
Reason #2 – You are paying closer attention
The second explanation for these hiccups during the first trimester is that women often start paying more attention to their bodies and feelings when they realize they are pregnant. The concern they feel for their growing child and having a healthy pregnancy leads women to notice things they may have overlooked otherwise, such as hiccups. You may have had hiccups before, but you worry that these are different or more severe than usual because you are hyper-aware of everything that is happening to your body.
Don’t worry, be happy
The good news is that whichever cause is at the heart of your hiccups, or even if both causes can be blamed, hiccups are harmless. They are certainly annoying but they do not indicate anything is wrong with you or with your baby, and they will go away on their own.