Flaxseed
A mild, nutty addition to cook into everyday foods. Always ground, never whole.
Checked against official guidance on October 18, 2026 · How we review
Quick answer
Babies can eat flaxseed from around 6 months, once they show signs of being ready for solids. Prepare it as shown below.
How to serve flaxseed by age
6 months+
Ground, cooked into soft food
Cook ground flaxseed (also sold as milled flaxseed or flax meal) into food: stir it into oatmeal while it cooks, or bake it into soft pancakes cut into strips once your baby has had the egg, wheat and milk in the batter on their own. Never serve whole seeds.
- Size
- A small pinch of ground flaxseed mixed into mashed food, or baked into soft pancake strips about the size of an adult finger, roughly 6–8 cm long and 2 cm wide (2½–3 × ¾ in).
- Check before serving
- Look closely before serving: there should be no whole seeds, and the powder should be mixed right through the food with no dry clumps.
US and UK advice differ here. The AAP suggests mashed food or soft pieces no larger than ½ inch; the NHS suggests soft finger-sized pieces your baby can hold in their fist. Both agree the food must squash easily.
9 months+
Mixed into soft foods
Stir ground flaxseed into oatmeal or sauces while they cook, or bake it into soft muffins or pancakes cut into small pieces.
- Size
- Pieces no bigger than about 1 cm (just under ½ inch), with ground flaxseed mixed in.
- Check before serving
- Squash a piece of muffin or pancake between your thumb and finger. It should flatten easily, with no whole seeds inside.
12 months+
Ground, in family foods
Cook ground flaxseed into oatmeal, sauces or baked foods. Check bread and crackers for whole seeds: the CDC lists breads and crackers with seeds as a choking hazard for young children.
- Size
- Bite-sized pieces about 1 cm (just under ½ inch), with ground flaxseed mixed in.
18 months+
Ground, in family meals
Keep using ground flaxseed only, cooked or baked into family foods. Keep checking breads, crackers and granola for whole seeds.
- Size
- Bite-sized pieces about 1 cm (just under ½ inch), or as part of a dish.
Always have your child sit upright in a high chair or at the table, and stay with them the whole time they eat. Keep to the size and texture for their stage. Every baby develops on their own timeline.
How to prepare flaxseed
- 1
Buy ground (milled) flaxseed sold as food, or grind whole flaxseed in a clean coffee or spice grinder until it's a fine powder with no whole seeds left.
- 2
Stir a small pinch into a food while it cooks, such as oatmeal, or into pancake or muffin batter before baking.
- 3
Mix well so there are no dry clumps. Flaxseed thickens food as it soaks up liquid, so add a little breast milk, formula or water if needed.
- 4
Offer sips of water from an open cup with meals.
How much to offer
Start with a small pinch cooked into food. Flaxseed is high in fiber, so build up slowly. Your baby decides how much to eat: stop when they turn away or close their mouth.
Common mistakes
Serving whole flaxseeds
Whole seeds are a choking hazard for young children. In one study, whole flaxseed baked into food didn't raise adults' blood omega-3 (ALA), while ground flaxseed did. Use ground flaxseed only.
Sprinkling it on top as a dry powder
Stir it into a food while it cooks, such as oatmeal, or bake it in, so there are no dry clumps. Don't stir raw ground flaxseed into cold yogurt or fruit.
Adding a lot at once
Flaxseed is high in fiber, and in adults larger amounts can cause bloating, fullness and diarrhea. Start with a pinch.
Forgetting about seeds in bread and crackers
The CDC lists breads and crackers with seeds as a choking hazard for young children. Choose seed-free versions, or ones made with ground seeds.
Questions parents ask
Can flaxseed be a choking hazard for babies?
Whole flaxseeds are small, hard seeds, and the CDC lists whole or chopped seeds as a choking hazard for young children. Ground flaxseed cooked or baked into moist food is the safe form. Check breads and crackers for whole seeds too. Stay with your child during meals.
Can babies be allergic to flaxseed?
Flaxseed is not one of the nine major food allergens in the US. The NHS lists seeds among foods that can trigger allergic reactions, so offer a small amount at first, like any new food, and watch your baby afterward.
Is flaxseed healthy for babies?
Rich in fiber and in ALA, the plant form of omega-3 fat. The body turns only very small amounts of ALA into DHA and EPA, the omega-3s found in fish. Flaxseed has about 5.7 mg of iron per 100 g, but a small pinch (about 2 g) gives only about 0.1 mg, so it isn't a useful iron food for babies.
Can babies eat flaxseed?
Yes, from around 6 months, if it's ground and cooked or baked into food. Whole seeds are a choking hazard.
Why ground flaxseed and not whole?
Two reasons. Whole seeds are a choking hazard for young children. And whole seeds seem to give the body less of their omega-3: in one study, adults who ate whole flaxseed baked into muffins didn't show a meaningful rise in blood omega-3 (ALA), while those who ate ground flaxseed did.
Can flaxseed help with constipation?
Flaxseed is high in fiber, but there's no infant guidance on using it to treat constipation, and in adults larger amounts can cause bloating or diarrhea. If your baby is constipated, talk to your pediatrician before using flaxseed for it.
Is raw flaxseed safe?
The NIH's complementary health center (NCCIH) advises against eating raw or unripe flaxseeds, which may contain potentially toxic compounds. Store-bought ground flaxseed is also raw, so we suggest cooking it in: stir it into oatmeal while it cooks, or bake it into muffins or pancakes, and use small amounts.
If your baby refuses flaxseed
- Many babies need 10 or more tries before they accept a new food. Keep offering it alongside foods they already like.
- Cook it into a food your baby already likes, such as oatmeal or banana pancakes.
- Try it baked into soft pancakes or muffins instead of cooked into oatmeal.
- Eat some yourself at the same meal. Babies copy what they see.
Never force or pressure your baby to eat. Some days they'll eat more, some days less, and that's normal.
Buying and storing flaxseed
- Keep ground flaxseed in a sealed container, and follow the storage advice and date on the pack.
- Muffins and pancakes made with flaxseed keep for 3 to 4 days in a covered container in the fridge.
- They can be frozen for 2 to 3 months. Reheat only once, to 165°F (74°C), until steaming hot, then let them cool before serving.
- Throw away any food left out at room temperature for more than 2 hours (1 hour if it's hotter than 90°F / 32°C).
When to talk to your doctor
Contact your pediatrician, GP or health visitor if:
- Your baby is constipated, has hard stools or a swollen tummy after you start adding flaxseed, or you're thinking of using it to treat constipation. Talk to your pediatrician first.
- You notice mild signs of an allergic reaction after eating, such as a few hives or a little vomiting. See signs of a reaction.
- You're worried about how much your baby eats, their growth, or they refuse most solid food for weeks.
Call 911999your local emergency number (such as 112 in Europe or 000 in Australia) now if your baby has trouble breathing, wheezing, can't cough or cry, has lips, mouth, tongue or throat that suddenly swell, or becomes pale, bluish, floppy or unresponsive. Also call if hives come with repeated vomiting.
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Helpful guides
Sources
- CDC: Choking hazards
- NHS: Food allergies in babies and young children
- NHS: Your baby's first solid foods
- FDA: Food allergies
- USDA FoodData Central: Seeds, flaxseed
- NIH Office of Dietary Supplements: Omega-3 fatty acids
- NCCIH: Flaxseed and flaxseed oil
- Austria et al., J Am Coll Nutr (2008): Bioavailability of ALA from three forms of flaxseed
- USDA FSIS: Leftovers and food safety
- USDA FSIS: Shell eggs from farm to table
- NHS Best Start in Life: Storing and reheating food
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