It's true that you can feel the temperature of foods/liquids you consume for a certain distance down your esophagus. However, your baby is all the way down in your uterus, which is on the other side of your stomach. Your stomach heats/cools things to exactly body temperature as it digests, so your baby isn't actually exposed to temperature differences based on what you eat or drink. It is perfectly safe to consume both hot and cold drinks while pregnant.
Benefits of Drinking Warm Water During Pregnancy:
Drinking tepid or lukewarm water renders many health benefits to both you and your baby. They are:
1. Warm water helps to detoxify your body to help prevent morning sickness, heartburn, etc. and thereby promotes healthy functioning of your body
2. It helps to ensure proper and healthy bowel movement and relief from constipation and acidity.
3. Warm water is responsible for improving blood flow in your body. A glass of warm water daily, especially with a small quantity of lemon in it, helps to boost stamina and energy levels in the mothers thereby keep fatigue away.
4. Warm water also helps to keep cold, cough and flu at bay and ensures the proper bronchial health of both of you.