Boden has stuff in pretty big size rages. It will be easier when infant gets to be 3, since Boden’s girl line goes from 3-14. But a lot of the baby clothes are made from the same prints and fabrics. You could do a dress for the 7 yr old and a pinafore for the baby, with the same fabric.

H&M

Children's Place

Princess Awesome or Svaha!

I just bought matching dresses for my 7 and 3 year old girls at Macy's. Same pattern, slightly different style. They had several like that.

Most brands have the same patterns across sizes, although the styles might be slightly different. I've bought matching/coordinating stuff for my girls from Carters, Old Navy, Gap, and Children's Place.

Princess Awesome, if that appeals to your/your kids style

I have a 6, 5, 4 and 1 year old girl, and they always match. Maybe 50% of the time I match them.

Lilly Pulitzer. Old Navy. AliExpress is great for this. Zulily/jane.com both have random stuff sometimes.

I gotchu!

Carters or Old Navy I think would be your best bet. Once baby is in 12M clothes, Old Navy's toddler section has a lot more matching stuff - look at their "family matching" ideas. https://oldnavy.gap.com/browse/category.do?cid=1108504&mlink=5151,,flyout_toddler_New_Now_Family_Matching&clink=15682852 or go to Carters and type in "dresses & rompers" in the search bar and then filter by "baby girl" and "kid girl" and everything lines up!

https://oldnavy.gap.com/browse/product.do?pid=483564022&pcid=999#pdp-page-content
and
https://oldnavy.gap.com/browse/product.do?pid=503995012&pcid=999#pdp-page-content

https://oldnavy.gap.com/browse/product.do?pid=484363022&pcid=999#pdp-page-content
and
https://oldnavy.gap.com/browse/product.do?pid=449388022&pcid=999#pdp-page-content
(this might be my fav)

https://oldnavy.gap.com/browse/product.do?pid=504186002&pcid=999#pdp-page-content
and
https://oldnavy.gap.com/browse/product.do?pid=449391002&pcid=999#pdp-page-content
(yes, I realize it's not the same color, but you get the idea)

https://oldnavy.gap.com/browse/product.do?pid=451216022&pcid=999#pdp-page-content
and
https://oldnavy.gap.com/browse/product.do?pid=451190002&pcid=999#pdp-page-content
(if baby can fit 12M clothes)

https://www.carters.com/carters-kid-girl-sets/V_38451310.html
and
https://www.carters.com/carters-baby-girl-sets/V_18552610.html

https://www.carters.com/carters-kid-girl-dresses/V_3A025810.html
and
https://www.carters.com/carters-baby-girl-dresses/V_1A042710.html

https://www.carters.com/carters-kid-girl-dresses/V_38437910.html
and
https://www.carters.com/carters-baby-girl-dresses/V_18358610.html

https://www.carters.com/carters-kid-girl-dresses/V_38909010.html
and
https://www.carters.com/carters-baby-girl-dresses/V_18917510.html

Primary.com for basic knit dresses. They are on mega sale right now.

https://www.primary.com/shop/baby/dresses/the-long-sleeve-baby-dress?color=grass&ref=plp_pdp_2&size=0-3

https://www.primary.com/shop/kids/dresses/the-long-sleeve-dress?color=cobalt&ref=plp_pdp_g1_4&size=6-7

Also, you have to spend a little more time digging, but Old Navy often has the same patterns and fabrics across the whole kids range of sizes. It is easier to find with christmasy stuff, but they tend to do it year round. Here, there are many options for matching items that work for baby and kid:

https://oldnavy.gap.com/browse/category.do?cid=1144726&mlink=5151,,flyout_maternity_Gifting_Matching_Gifts_for_the_Family&clink=15682852

If you like the preppy, traditional look but don't want to spend a fortune, try Smockingbird kids.

Tshirts at old navy perhaps?

If you are looking for something preppier/dressy, Bella Bliss often has a few dresses that have matching baby versions of older girl dresses. Beaufort Bonnet does, too. You can also filter Lilly Pulitzer by size and print and there are usually a couple of prints per season that come in baby and big girl and even adult sizes.

If those aren’t your style, Peek Kids sometimes has coordinated looks or fabrics between baby and bigger sizes although they usually don’t match exactly. I find that their sizes run huge for baby stuff, btw. I agree with the recommendation to try Primary for plain everyday matching outfits, too.

Source: I like to shop.

What size is your 7 yr old wearing?

You may have to get her to settle for matching colors. Hannah Anderson can probably do it. Primary does it.

My 7 year old really wants matching clothes (mainly dresses) for her baby sister (6 months old). Anyone have good recommendations for where to buy matching clothes with this large age range? My usual places to look seem to be very hit or miss.