Can You Switch Prenatals Mid-Pregnancy? Here's What Actually Matters
Written by Jess Rosenberg, moode Founder | Last reviewed June 2026
This question lands in our inbox almost every week.
"I've been taking (other brand) since I started trying. I'm now 8 weeks. Can I switch?"
"I'm 22 weeks and my prenatal is making me feel awful. Can I change it?"
"I've read about the different forms of folate and I want to move over. Is it too late?"
There is a version of pregnancy where every decision feels enormous, because so many of them are. You are growing a human. Anything you change feels like changing the recipe on something important.
But switching prenatals is one of the smaller decisions you will make, medically speaking. It is often made bigger than it needs to be by the emotional weight of pregnancy itself. So here is what actually matters, and what does not.
What actually matters when switching prenatal vitamins
Continuity of nutrients, not continuity of packaging.
What your body needs is adequate folate, iodine, choline, iron if you need it, and B vitamins across the entire pregnancy. Whether those nutrients come from Brand A for the first trimester and Brand B for the rest, or from one brand start to finish, makes no meaningful clinical difference to the outcome.
What matters is that the switch does not leave you with a gap in a key nutrient. Look at what your new prenatal actually contains before you commit. If it has similar or better forms and doses of the nutrients you were previously getting, you are covered.
Consistency of use.
Taking a prenatal daily matters more than taking the "perfect" prenatal half the time. If a switch makes you more likely to actually take your prenatal, because it is easier to swallow, better tolerated, or does not cause nausea, that is a net win. Consistency is doing more of the work than most people realise. For more on why tolerability matters so much, see Do Prenatal Vitamins Have Side Effects?
Your stage of pregnancy.
The first trimester is the most critical window for folate specifically. If you are switching in the first trimester, make sure your new prenatal has an active form of folate (calcium folinate, methylfolate, or 5-MTHF) at a therapeutic dose. In the second and third trimesters, choline, iodine, and adequate B vitamins carry more of the weight.
What you do not need to worry about when switching
A day or two of overlap or gap.
If your new bottle arrives before you finish your old one and you take both by accident for a couple of days, that is fine. If you finish your old bottle and have to wait a day or two before the new one arrives, that is also fine. Prenatals work cumulatively over weeks, not hours.
The exact week you switch.
There is no clinically wrong trimester to change. Some women switch specifically because their first prenatal was not tolerable in early pregnancy. Others switch later because they have done more research or their needs have changed. Both are valid.
Whether you finish the bottle.
Guilt about wasting the remaining half-bottle of your old prenatal is not a reason to keep taking something that is not working for you. Donate it, bin it, or gift it to a friend who is just starting. Start the new one fresh.
How to compare prenatal vitamins before switching
Which form of folate should your prenatal contain?
Folate is the single most important nutrient in a prenatal, particularly in the first trimester and preconception. The neural tube, which becomes the brain and spinal cord, forms in the first 28 days of pregnancy, and folate is critical to that development.
There are two main forms on shelves: folic acid (the synthetic form, requires conversion by the body) and calcium folinate, methylfolate, or 5-MTHF (the active forms, ready to use). Around 40% of the population carries a genetic variant that reduces their ability to convert folic acid efficiently. Even without the variant, the active form is what your body ends up using, so many women prefer to take it directly. For a full breakdown, see The Ultimate Guide to Choosing the Best Prenatal Vitamins.
Does your prenatal need to contain iron?
Some prenatal's contain iron. Some do not. Neither is inherently better; it depends on whether you actually need iron.
Many women do not need supplemental iron in the first or second trimester. Iron levels are checked routinely at antenatal appointments, and if you are low, your GP can prescribe iron separately in the form and dose that suits your body.
The forms of iron in most off-the-shelf prenatals (ferrous fumarate, ferrous sulfate) are poorly absorbed and a common cause of nausea and constipation. If your current prenatal is making you feel unwell and it contains iron, this is often why.
How much choline should a prenatal vitamin contain?
Choline is critical for foetal brain development. The Australian NHMRC Adequate Intake during pregnancy is 440mg per day. Despite this, a 2023 study published in the European Journal of Nutrition using Australian data found that only 23% of pregnant women met this recommendation through diet. A separate PMC study of pregnant Australian women found that only 2.6% were taking a prenatal supplement containing choline at 50mg or above per day.
Most Australian prenatals contain 30 to 50mg of choline. The Prenatal by moode contains 300mg because we felt the standard doses were too low relative to the recommendation. Diet contributes some (eggs are the main source), but for most women, prenatal choline is where the majority needs to come from. For a deeper look at why choline matters, see Championing Choline: The Unsung Fertility Nutrient.
Could your prenatal be causing your nausea or constipation?
If your current prenatal is causing nausea, constipation, or digestive upset, a switch can genuinely help. It is often the form of iron, the capsule size, or the overall dose. There is no medal for pushing through a supplement that makes you feel unwell.
How to switch prenatal vitamins without missing a dose
Order your new prenatal before you finish the old one. Aim for a couple of days of overlap so you do not have a gap.
Take the new one from the day you start it. No taper needed. You do not need to wean off the old one or ease into the new one.
Note any differences over the first two weeks: tolerance, energy, digestion. This is useful information to share at your next antenatal appointment. For more on what to expect at those appointments, see Prenatal Care Options: Australia.
Mention the switch to your care team. Your midwife, GP, or obstetrician does not need to authorise the change, but it is completely normal to cross- check. If you have any specific health considerations, always speak with your healthcare provider.
Why switching prenatals feels harder than it is
The reason so many women hesitate to switch prenatals is not clinical. It is the feeling that changing something mid-pregnancy is risky, or ungrateful, or a reflection on their earlier choice.
None of those things are true. Pregnancy is nine months of new information, and it is normal for your understanding of what you want in a prenatal to evolve as you go. Choosing the version that serves you better in month five is not undoing the choice you made in month one. It is just responding to what you now know.
If the prenatal you are on is not serving you, for any reason, you are allowed to change your mind.
moode answers your questions about switching prenatals
Do I need to take my new prenatal at the same time of day as my old one?
No. Take it when it suits you, ideally with food. Consistency of taking it matters more than the specific time.
Can I switch prenatals in the third trimester?
Yes. There is no trimester where switching is contraindicated. The third trimester is a normal time to reassess if your current prenatal is not working for you.
What if I am breastfeeding? Can I switch then too?
Yes. Most women stay on a prenatal or a postnatal formula through the first six months of breastfeeding at minimum, and switching between products during this time is fine.
Should I tell my GP or midwife I have switched?
It is worth mentioning at your next appointment, particularly if you have specific health considerations such as thyroid conditions, MTHFR, or iron deficiency history. For most women, it is a routine conversation rather than a required one.
Can I take my old prenatal and my new one together for a few days?
As you would be doubling up on nutrients, we'd recommend taking one or the other.
About the author
Jess Rosenberg is the founder of moode and is trained in Nutrition and Naturopathy. She created The Prenatal after her own experience of pregnancy left her questioning the quality of what was available on the Australian market. Learn more about moode.
