Sunscreen.

"Sunscreens are used commonly to protect the skin from the sun's harmful rays and have been found to cause very little toxicity. The products have very limited dermal or systemic absorption. Sunscreens have been used in pregnancy to treat or prevent melasma and adverse events have not been reported. Your skin is generally more sensitive during pregnancy and you're prone to things like melasma, so not using sunscreen is terrible. You should be using sunscreen on a daily basis anyway, and I think it's really important to continue using it during pregnancy. Even if you're at home and sitting near a window you should always wear SPF, and even halfway throughout the day you should try and top it up, especially when you're pregnant because you are more prone to getting melasma. If you're outside every hour as well, it's really important."

"The most important thing in your routine is sunscreen, and you need to reapply it every two to three hours, especially if you're going outside. For example, if you apply sunscreen at 8 or 8:30 in the morning and leave home at 9, by 11 or 11:30 it becomes completely ineffective, so reapply it then. And then reapply it again if you're going out around 3 or 4 in the afternoon. So reapply your sunscreen every two to three hours."