SumGood Foods Inc. · Scientific reviewer: Dr. Bohdan L. Luhovyy, PhD, MSVU · · 8 min read
Your baby gets her water needs met first. You get whatever's left.
That's not poetic license. It's biology. Breast milk water content stays remarkably steady at around 87% regardless of maternal hydration status, which means a mother can be measurably under-hydrated while her baby's intake looks unaffected. The signs show up in her: headaches, fatigue, slow recovery, muscle cramps. This guide covers what the research says about lactation hydration, the supply myth, and what to actually do.
Important: This article is for general education and is not medical advice. Always involve your IBCLC, midwife, family doctor, or pediatrician in decisions about lactation, supply concerns, or any postpartum complication.
How much water do you need while breastfeeding?
The IOM Adequate Intake for lactating women is 3.8 L/day total water, about 1 L higher than the 2.7 L non-lactating baseline (IOM DRI, 2005). The +1 L isn't arbitrary: it accounts for the water content of milk production (around 750 mL/day for an exclusively breastfed infant) plus the increased maternal metabolic rate.
"Drink to thirst" is incomplete advice during lactation. Thirst is a lagging signal in adults generally, and in postpartum women dealing with sleep deprivation, recovery, and a feeding schedule, it lags even further. The +1 L AI is meant to be hit deliberately, not opportunistically.
Why are so many breastfeeding mothers under-hydrated?
A 2024 study in Nutrients found exclusively breastfeeding mothers averaged a negative water balance of −475 mL/day, and 54% of breastfeeding women in a separate survey consumed less water than recommended (Nutrients, 2024; Nutrients survey, 2024).
The barriers are practical, not motivational. Cluster feeding can mean 8+ feeds in a day where one hand is permanently committed to a baby. Postpartum recovery, sleep deprivation, and the cognitive load of a newborn make "remember to drink" surprisingly hard. And many women don't realize their baseline target jumped by a full litre: they're trying to maintain pre-pregnancy intake during a phase that demands meaningfully more.
The biology compounds the practical. Your infant is biologically prioritized: the body channels water toward milk production before it channels it toward your own non-essential needs. So a mother who feels "fine" while inadequately hydrated may not see any drop in baby's intake. She sees it in her recovery: fatigue, headaches, muscle cramps, slow healing.
Does dehydration affect milk supply?
Breast milk water content stays remarkably steady at around 87% regardless of maternal hydration status (Nutrients, 2024 review). Severe maternal dehydration can reduce supply, but mild-to-moderate dehydration typically doesn't show up in volume. It shows up in the mother.
The supply myth deserves a clear correction. Drinking extra water beyond your body's needs does not boost milk supply. Supply is regulated primarily by demand (frequency and effectiveness of milk removal) and the hormones prolactin and oxytocin. Telling a mother who's already producing enough milk to "just drink more water" is well-meaning but misses the mechanism.
The reason to hydrate during lactation isn't to feed your baby better. It's to feed yourself better. Postpartum recovery, mood, energy, headache prevention, and physical healing all benefit from meeting the +1 L AI consistently. If you're concerned about supply specifically, talk to an IBCLC (International Board Certified Lactation Consultant) or your midwife.
What should you drink?
Water remains the foundation. Beyond that, drinks contributing toward the 3.8 L AI include: milk, broth-based soups, herbal teas (with caution about specific herbs that interact with lactation, check with your IBCLC), 100% fruit juice in modest amounts, and clean-label electrolyte beverages within Health Canada ranges. Health Canada AI for potassium during lactation is 2,800 mg/day; Tolerable Upper Intake for sodium is 2,300 mg/day for adults (Health Canada DRI: reference values for elements).
What to limit: high-caffeine all day (passes into breast milk; check with your provider for individual tolerance), alcohol close to feeds, excessive added sugar from juices and sweetened drinks. What to be cautious of: very high-sodium sports drinks designed for elite athletes: these were calibrated for sodium-loss conditions most lactating mothers aren't in.
Electrolyte beverages can earn a place in the routine for active or hot-climate breastfeeding mothers, postpartum women returning to exercise, or anyone whose general intake of fruits/vegetables/potassium-rich foods is on the low side. SumGood freezies are made with pressed fruit, potassium, and East Coast sea salt: no artificial dyes or added sugar. As with any new food during lactation, discuss with your healthcare provider or IBCLC.
How do you build a hydration routine that actually works?
Adherence beats optimization. The most effective lactation hydration strategy is the one that fits inside your already-stretched day. Practical wins from the lactation literature and IBCLC clinical practice:
- A labeled water bottle within arm's reach of every feeding spot: nursery, couch, bedside, kitchen
- A sip whenever baby latches (a useful conditioned cue once it becomes habit)
- Water at every meal: this alone often hits half the daily target
- Variety to prevent palate fatigue: water, water + lemon, herbal tea, broth, fruit-water infusions, occasional electrolyte beverages
- A small water bottle on the nightstand for night feeds
- Letting partners and family members do the "did you drink today?" check-in
None of this is revolutionary. It's just enough scaffolding to make hydration happen even on the hardest days.
When should you talk to your healthcare provider or IBCLC?
Talk to your IBCLC, midwife, or family doctor if you're concerned about supply, struggling with dehydration symptoms despite trying to drink more, dealing with mastitis or other complications, or managing a medical condition that affects fluid balance. Red flag dehydration signs include dizziness, persistent headache, very dark urine, rapid heart rate, decreased urine output, or sudden mental fogginess.
SumGood is a food product, not a medical-grade rehydration solution. If you have HG that persisted into postpartum, severe gastroenteritis, or any condition that requires medical-grade rehydration (oral rehydration solutions like Pedialyte, or IV fluids), follow your provider's guidance. Food products and home strategies aren't substitutes for clinical care.
Frequently asked questions
How much water should I drink while breastfeeding?
IOM AI is 3.8 L/day total water, about 1 L more than non-lactating baseline. Includes water from food and other beverages (IOM DRI).
Will drinking more water increase my milk supply?
No, beyond what your body needs. Supply is regulated by demand and hormones, not by extra fluid intake. Drinking enough supports your recovery, not your baby's intake (Nutrients, 2024).
Are electrolyte drinks safe while breastfeeding?
Within Health Canada ranges and free of excessive sodium, dyes, and added sugar, generally yes, but always discuss with your healthcare provider, especially if you have hypertension or kidney concerns.
What if I have hyperemesis or postpartum complications?
These warrant medical attention. SumGood is a food product, not a medical rehydration solution. Talk to your healthcare provider.
Is SumGood safe to drink while breastfeeding?
SumGood is a food made with pressed fruit, potassium, and East Coast sea salt. As with any new food during lactation, discuss with your healthcare provider before introducing it.
The bottom line
- Lactation target: 3.8 L/day total water (IOM AI), +1 L vs non-lactating baseline
- 54% of breastfeeding women fall short; the under-hydration shows up in you, not baby
- Drinking more water doesn't boost supply. It supports your recovery
- Build the routine on existing cues (feeds, meals, bedside), not willpower
Read more: hydration through life's sensitive stages · hydration during pregnancy