Sewing question on kids clothes, not quilting
 

My grandson has a problem that every brand and size of pants his mom buys him is like they are not long enough in the back and his butt crack shows. He has a chunky but but it seems like he is just long in that area and none come up far enough.
Does anyone that sews or have kids with this problem have any ideas on alterations or ways to fix this?

Just wondering his age and the size pants? Toddler pants have extra room for a diaper which in most cases is enough to avoid the problem. But if he is out of diapers that isn't the issue and maybe look for different brands or cuts of pants. For example avoid low rise. Let us know how it turns out.

I think a huge problem is pants are made low rise nowadays which makes it hard to find pants that cover the butt generously

It is possible to alter the crotch seam. If you took in the seam from the center front to the center back, it would lengthen the crotch. If the front crotch length is ok, and it was just the back that was the issue, don't take in much of the front seam, just take in the back and blend into the front.

Buy the pants LONG, because this alteration will shorten the leg length a bit. It will also cause you to loose a bit of the hip width.

To shorten a too-long crotch, you would alter the crotch from leg inseam to leg inseam... but that alteration will narrow the legs of the pants somewhat... and lengthen the legs.

If the butt area is a bit baggy you could alter the depth of the crotch seam, as in this diagram, but that will make the legs shorter and tighten the pants across the backside and the front, so I would try with inexpensive garments first.
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How old is your grandson?

If you look at him from the side, is his natural waistline parallel to the floor - or does it slope down in front?

This calls for an alterstion not found in many alteration books.

Backsides come as "flat, average, and rounded" - lok at the alterations for "full derriere" to get some more fabric in the area.

You might need to change brands to find a style that fits him better.

Boys sizes come in "husky" which should give him more fabric in that area but could cause too much fabric in other areas. But, better to take in than let out as they don't make them with any extra seam allowance. On men's sizes, he would have to try big/tall sizes.

Oh i have a two yr old Great Grandson who may end up with this problem. He is soooo heavy to pick up now.

It's important to know his age and the type of pants you are talking about in order to answer the question. Are we talking jeans of pull on types?

if you are sewing him pants, you can lenghten the pants across the bum area above the crotch curve to lenghten the area. If they pull down because are tight across the bum, add fabric to the entire middle seam , curving into the point where the leg actually starts.

If you are altering them (and with jeans I would just buy a more generous cut) buy larger and then take it at the side seams if too big.

The husky size will probably fit a lot better.

Nice directions. I do a lot of patching and altering, and appreciate such good directions. Always something to learn!

Take it from a person who has sewn to cover what we affectionately call “Bivens Butt” the reason those pants don’t fit is because commercial pants are fitted to average bottoms. Our bottoms are also called “bubble butt”. We need slightly wider in the back, and about an inch or more deeper. I do this by ironing the pattern, then cutting the pants back pattern into five pieces. Divide them at the hip and knee crossways, and down the center of the top two pieces. Lay the pieces out on butcher paper. Tape the bottom piece in place to fit back to. Spread the top pieces by enough to fit the measurement fron side to side across the widest part of his buns (not by 1/4 of hip circumference!), then tilt out the next two pieces to meet the new seam line above, and old seam line below. Trace the new pattern shape and gently curve where needed to get a smoother outline. It you have done this right, you will end up with a four pointed star “hole” in the center area of the old pattern. I then add the inch and a half to the top of the center back seam, and curve it to meet the side seams. Proceed as indicated on the actual pattern. If you have done this right, your pieces will still fit together just as if you never adjusted it.

This illustration is pretty close to what madamekelly has described:

http://aces.nmsu.edu/pubs/_c/C228/welcome.html -

scroll down to Pants Alterations, then to Protruding Derriere

Thank you for this. I can’t draw for squat. Lol.

I have 2 sons and many years ago if I bought a larger size it would be longer in the crotch, but I don't know how
that is now. If you are good at this, take the band off and add more Denim at the top if he is little. Don't know what
to do otherwise. Have her take a tape measure and before she buys check the pant back.

I can try on 15-20 pairs of pants and only find 1 or 2 that fit correctly, so I assume there are pants to fit him too. The trick is to keep looking and trying on until you find a good fit.