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RNP for sure hands down our most used for both, swing for LO1 is second, and bouncer for #2 is second.

The swing was huge with both girls. Strollers and carriers got a lot of mileage.
DD1's Tripp Trapp is still used so much we ended up buying another for DD2 and one for DD3 too.

Our son sleeps with his Marpac Dohm and humidifier every night so we're probably going to have to buy dupes for LO2. LO2 will reuse the RNP and bouncer, although DS was never super into them. We still use/love his Ikea high chair but we'll probably move him to the FP travel booster we have and reuse the Antilop for LO2. We adore our UP Cruz so we'll probably just put LO2 in it and have DS use the Mountain Buggy Nano, but we love our UP products (LO2 will use the Mesa carseat) so we are thinking about selling the Cruz and Nano and getting the UP Glink umbrella double stroller!

Definitely the Rock n Play, swing, swaddles, and most clothes (both boys).

So far it's been the Rock n Play, definitely.

Not sure if this counts because I have twins but both like the mamaroo.

Infant carseat, cribs/mattresses, clothes, stroller, ergo, cloth diapers, dresser with changing pad, bottles have all been through all 3 kids. They each have their own noise machine, the oldest at 4 still uses his, we sleep with white noise in our room too so who knows if he will ever stop using it.

@oliviaoblivia: We bought a second tripp trapp too, love it. Debating about buying the third for the new LO, the oldest could theoretically sit in a chair but its probably more comfortable for him to eat in his own chair plus its nice for them to have their own thing!

Our kids hated pretty much all the gear: screamed in strollers so they were only used a handful of times, no bouncer or swing would do for either, no exersaucer, hated the pack n play, etc.

We did use the following for both: all the clothes that weren't destroyed with our first DD, the crib, the car seats, the iBaby monitor, the A&A swaddle blankets, the Arms Reach cosleeper, and the high chair.

We got a Rock n Play for DD2 that we used a lot when she was a newborn, and I bet DD1 would have loved it too.