Boys can never have too many building blocks or wooden trains/tracks.

PS I realize they can't play with these yet, but since you said they had everything practical covered. Also books for young children, like Three Musketeers and 1001 Nights, never too early to start a nice library.

A baby calendar for marking those "firsts". calendar, not book, so it can go on the wall and be a handy spot to mark. Include a 4-color pen tied to the calendar so it doesn't get lost. it's too easy to lose the second one's firsts, just ask my younger one!

(I remember a little poem from Saturday Evening Post back in the 60s:

"Of our first little heir we have pictures to spare,

but there's hardly a shot of the last of the lot."

Can you ever have too many diapers?

Notice that they are 16 months apart, that's a whole season, so they may need clothes for the appropriate size and season. Then, too, you don't know their sizes. My two are 5 years and 1 week apart, but the younger was a pound heavier, and half-a-season bigger. He always outgrew his brother's stuff midway through the season. So they will need clothes anyway!

I can't speak more highly of Amanda and her Alphadorable baby gift company. I have ordered the step stool which she matched identically to the wall decor of the nursery.

I then sent her the wall decor of another nursery and she copied that onto a fuzzy blanket.

Both gifts were greatly received and talked about!

If you know what the boys's rooms look like, you can have personalized blankets made for both of them.

When it's second baby, I usually give something for the oldest. Although at 16 month the oldest might not realize what is actually going on.

Good wishes? A chit for baby sitting services so the parents can go on a date?

Is she impractical and fancy? I just gave someone hand printed OTT alphabet cards and they loved them.

Mine were stupid pricey, but Etsy has cute ones...

https://www.etsy.com/listing/210472407/animal-alphabet-flash-cards-4-x-6?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=alphabet%20cards&ref=sr_gallery-1-1&organic_search_click=1

https://www.robeez.com/baby-shoes/boys-baby-shoes/

Robeez shoes. They get worn out once the kid starts walking.

How about books with the new baby boy's name in the title. Very easy to find on Amazon!

I usually put in a pack of The Original Baby Cards by Milestone- pretty cute!

I've been buying engraved baby dinnerware or spoons on Etsy for gifts.

Great ideas! Thanks all!

I give these, and the parents love them. Personalized baby blankets from Etsy. I prefer the ones with their name in large script, and a place to lay the baby on the blanket while marking it's age with a teething ring or whatever . . . and then photographing the baby to send to friends and family each month..

There are many vendors to choose from, as well as many designs. When searching, it's quicker I've found to specify "baby boy milestone blanket". A true personalized keepsake.

Lynn...those are adorable...thanks!

OK, go ahead and hate on me, but I'm a full blown grinch when it comes to presents, as I think our society is gift-happy, so IF I felt the need to send a gift, and because both families are "well off", I'd give a donation in their honor to a local diaper bank.

One thing for sure- if you are near them, I am fairly certain that a dinner or meal or anything like that would be greatly appreciated. I know some people set up meal trains and it's wonderful. That is aside from a gift, but I think it's such a great idea. Someone sets up a calendar with the new parents' circle of friends/family and people can pick a date and bring dinner. It can be home cooked of course, or even just letting someone know that you are bringing over pizza and whatever.

THey did this for my daughter when she had her 2nd, and it was really a wonderful thing to know that a few nights a week, dinner was going to be taken care of.

Two under two -- I guess most of my ideas involve necessities like diapers, wipes, double stroller...It's gonna be a lot of work!

Yes, two under two is going to be just a WEE bit stressful at times ... My brothers are now grown men, but I still remember them very small, 22 months apart, and how much work it was at times to keep them corraled. (I was a teenager when they were born.) You've been given some lovely ideas above, and I think that anything you choose to mark the arrival of this new baby -- each, of course, so special in their own way -- will be warmly appreciated.

I like those milestone blankets a lot; in fact, may order one for a colleague who is expecting his first child.

I recommend Sophie the Giraffe and give it to all new mom's I know. There's even a Wikipedia page on it. #1 selling baby toy on Amazon.

If the older brother has one, baby brother needs his own. For a teether they're a bit pricey but every baby loves them.

The cards Mtn. recommended are a great idea to hang near the crib. Something that baby can look at.

My brother and I were sixteen months apart and I swear my mom reminded us of that until the day she died. It must have been he!! on her. lol

You can choose a great gift for your nephew's baby. All children love to play. So it would be cool to give some educational games that would be interesting and useful to the child. Since the baby is still very small, it is unlikely he will like puzzles and logic games. Maybe you've heard of such wooden toy sets for one-year-old children. They are great for having fun and benefit from spending leisure time with your child. If you want to pick up something other than toys, you can look at interesting gift ideas for one-year-old children at https://bopto.com.au/blogs/news/gift-guide-the-best-montessori-toys-for-a-1-year-old.