Momyknows Discount Code SAVE30 is a public discount code for the maternity fashion brand Momyknows, advertised as giving up to 30% off when you enter the string SAVE30 into the promo field at checkout on momyknows.com. This article is not a review of the brand so much as a walkthrough of the mechanics: where the field usually hides, what a successful application actually looks like on screen, and the short list of things worth trying when the code comes back refused. The eight characters are the easy part. Reading the order summary properly is where shoppers most often go wrong.

Two checks save time later. The first is the address bar. Momyknows is spelled with a single "m" in the middle — momyknows.com. There is a separate company with a similar-sounding name selling maternity health supplements, and it is a different business entirely. If the products on screen are supplements rather than clothing, SAVE30 has nothing to apply to.

The second is sizing. Momyknows publishes a size guide at /pages/size-guide and a returns and refund policy at /pages/return-and-refund. Open both in separate tabs before you start adding items. Maternity sizing shifts as a pregnancy progresses, so a garment that fits at one stage may not fit weeks later, and guessing is the most common reason an otherwise good order ends in a return. A discount code does not fix a fit problem, and the specific return window and whether sale items can be sent back are things to confirm on the policy page itself.

On most online stores the discount field appears in one of three places, and it is worth knowing all three because you may only see one of them.

If you cannot find a field at all, expand every collapsed heading in the summary column before concluding it is not there. Narrow phone screens frequently collapse the order summary into a single tappable line, and the code box lives inside it.

A confirmation message is not proof of a saving. What you want to see is a structural change to the order summary: a new line item, usually labelled discount or something similar, carrying a negative figure, and a subtotal that is lower than it was a moment ago. Some stores also show the code name next to that line, so you can confirm the reduction is attributable to SAVE30 and not to something else already in your basket.

Work through the numbers rather than trusting the impression of a discount. If the full 30% lands, you pay 70% of the pre-discount figure — roughly three tenths of the total comes off. So take the negative figure on the discount line, compare it against the original subtotal, and see what proportion it represents. If it is well short of three tenths, that is the "up to" wording behaving as written rather than a malfunction.

That distinction matters because "up to 30%" is a ceiling, not a promise. Percentage codes are commonly written so they cover some categories and not others, or so the reduction scales with basket value. The checkout total is the real offer; 30% is only the upper bound of what it could be.

Momyknows states free shipping on orders of $79 or more, which also confirms prices are in US dollars. A percentage code reduces your subtotal, and a lower subtotal can push you back below a free-shipping threshold. If your basket sits a little above $79 before the discount, check what happens after the code applies: if a shipping charge reappears, it will offset part of what you just saved.

It is not published anywhere reliable whether SAVE30 interacts with that threshold at all — whether the store measures the $79 before or after the discount. The checkout answers this in seconds, so treat it as something to observe rather than predict. If shipping does reappear, one option is to add a further item so the post-discount subtotal clears the line again; the percentage code returns more on a larger basket in any case.

A refusal is not the end of the attempt. Work through the common causes in ascending order of effort.

Several conditions that would normally shape a code like this are not published for SAVE30. It is not known whether it excludes sale items, nursing bras, swimwear or plus sizes, and it is not known whether there is a minimum spend, an expiry date or a first-order-only restriction. That means a refusal or a partial reduction cannot be diagnosed with certainty from outside the checkout — but it also means the fastest route to an answer is simply to try, since the code is public and requires no account relationship, invitation or prior order.

Because the reduction is proportional, the same code returns more on a bigger order, and a bigger order is also more likely to clear the $79 shipping line. Consolidating needs into one transaction is therefore the practical move: a gender reveal outfit alongside a set of nursing pyjamas, or a photoshoot dress together with everyday maternity tops. Recurring silhouettes across the range include maxi, bodycon, lace, floral and off-shoulder, so an event look and everyday wear can come from the same order.

The inverse is also worth stating. On a single small item, a percentage reduction produces a modest sum and shipping may still apply, so the code does less work. And if sizing is still uncertain, the discount is not the variable that decides whether the purchase succeeds — the size guide and the returns policy are.

Read the size guide, read the returns page, build the basket you actually want, enter SAVE30 in the discount field, and then judge the offer by two lines only: the discount line and the shipping line. If the reduction is real and the shipping position still works afterwards, the code has done its job. If the number barely moves, you have spent a few seconds typing eight characters and lost nothing else. Either way, the total on screen at the moment you pay is the only figure that counts.

Promotional terms, eligibility and values are set by the provider and can change at any time. Always confirm the current terms on the official site before signing up or completing a purchase.