Next, remember that in the shariah, fasting is required in Ramadan. When you are pregnant, you may take an exception or rukhsah and not fast. So if you can, the default is to fast. And if you think it's hard to fast pregnant in the summer, try fasting in the summer while you're nursing and with a baby around (which is where you'll be in Ramadan one year from now!). So unless you want to be sitting there with several years in a row of Ramadan to make up, you should really try to fast as much of Ramadan as you can.
Also, a lot of what you can do depends on where you are in pregnancy. Absolutely the hardest time to fast is 6-14 weeks of pregnancy. This is when the stomach causes the most trouble: nausea, vomiting, queasiness, reflux, etc. Some patients have quite minimal symptoms, while others are on around the clock anti-nausea meds. But if you're in this stage of pregnancy, and you have been eating every 1-2 hours just to keep the nausea at bay, fasting may not be reasonable. However, some patients can't fast the first two weeks of Ramadan, but by the time the last 10 days come around, they are able too.
Of course, there are exceptions, but as you can tell, I generally encourage my patients to fast in Ramadan. In the summer, I do give a few rules. These are rules for my patients, not guidelines.
1. All my pregnant patients must wake up for sahoor (the pre-dawn meal) and must have 1 liter of water during that time. It's hard to drink that much that fast, so give yourself time. something that also works, is to drink a glass, pray 2 rakah, drink a glass, etc.)
2. All my pregnant patients must have another liter of water after iftar, before they sleep.
3. If either of the above are not done for that particular day, my patients are not allowed to fast that day.
4. During the day, I instruct my patients to be wary of signs of significant dehydration. Primarily: lightheadedness or dizziness. Should this occur, they have to break their fast and start taking down water.
5. Another sign of dehydration after 20-24 weeks of pregnancy is contractions. Sometimes, when the body is dehydrated, the uterus starts to contract. So for women further along in their pregnancy, if they start to feel regular contractions or cramping, they also have to break their fast and start drinking a lot of water.
And God knows best.
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