Dumb question but when you say "no status", you mean the simple fact that you're not in a premium cabin or do you mean you wont earn credit on your flight for your specific mileage program? (i.e. flying another company who is not part of your "group"). Sorry if this seems obvious but I just wanted to clarify.

I'm assuming you're using miles, since that's the only way the price of 2x J can equal the price of 3x Y. In that case, 2x J for sure.

I mean status by no express security, premium seating, lounge, etc. The other problem is that my baby's personality changes all the time as he grows... so I have no idea what he'll be like in a couple weeks let alone in two months!

I think I'm leaning toward J and seeing what happens...

2 in J means holding the baby all the time.

But you won't get lounge access on a US only flight, and in coach, there's really no premium seating on CO. Right now, "premium seats" are just those seats closer to the front of the aircraft. The only seats in coach with more legroom are the exit rows (out for you) or the bulkheads. The rest are just the same.

Depends on your kid. Mine screamed bloody murder in his car seat until he was about a year and a half old. Getting him to sit in a constrained space, buckled in, for 4+ hours would have been hell for us and everyone around us. Having him curl up into me and fall asleep while I read a book was easy.

The no status is not about the seat so much, or lounge access (not worth much on CO) as the ease of moving through the airport - and the treatment you will receive if there are delays/cancellations, etc. J will make the entire travel experience much easier.

Another vote for 2J

Both kids loved to curl up in the lap.. and the breastfeeding helped to calm them down when little.. 2 year old still breast feeds, and I find having that extra seat helped a ton..

We will be trying Business Class going to London.. will be interesting to have Business Class seats, and how we handle our 2 year old in J for a long flight..

This is a common misconception. Just to clarify, having the car seat does NOT mean that the child has to be strapped in the entire flight. They can get up and move around the cabin, just like other passengers, when the seat belt sign is off.

My kids hated their car seats too but they knew when they had to sit in them. Our flights are 11 1/2 hours so yeah, that wouldn't have been very realistic to have kept them buckled the whole time. Still, they were safe on take-off and landing, the most likely times when an accident could happen. Also, I had somewhere to put them when they fell asleep. It's nice to have your child cuddled on your lap but good luck going to the restroom when you need it!!!

3 in Y.

As point out above, 2 in J means someone is holding the baby, which means that one of is going to be eating and another is going to be watching (by now, you're probably used to it ;)). Also, at six months, baby should be able to sit up with a little assistance, making it easier to put baby next to you for a few moments when you need a break. Plus you can get baby to spread out on the third seat if/when baby falls asleep, freeing your lap for a little while.
This is all assuming you are not using a car seat.

6 months is way to squirmy of an age to hold baby in my lap for 4 hours!

2 in J always. you are almost sure to get a bassinet row anyway. our babies never liked being in them but its handy to store stuff and then you can hold baby or even lie down with them sleeping on you which is much easier than having them cry in a bassinet. For meals you'd just take it in turns, its not that hard - and in J they will be able to keep it warm for you etc

Good for you :) My eldest was an avid breastfeeder and the final long haul when she was getting close to 2 and just wanted to do it constantly I swore never to fly with her again till she'd weaned! The youngest (16mths) is totally different and generally isn't even interested in the classic 'feed on take off and landing advice' that everyone seems to give..

We fly from Syd-London almost every year and where poss upgrade to business - it makes a huge difference. 4 year old now loves it - though of course she would be fine in Y. But its great with the 16mth old too as she would be on one of us most of the time anyway - otherwise running amok in the cabin!

The youngest (16mths) is totally different and generally isn't even interested in the classic 'feed on take off and landing advice' that everyone seems to give..

Funny how different kids have different needs. The whole process is different for each.

This is a common myth that somehow feeding on take-off and landing is supposed to help their ears. I hated seeing children woken up and forced to drink. I let mine sleep and they never had any ear problems.

With an active toddler, it can be impossible to force them to breastfeed or even drink anything when they aren't interested. Take-off can be fun for them (if they didn't sleep on the taxi to the runway...)

It's nice to have a seat to place a baby in when sleeping. In business, it's possible if the seat is wide enough but some airlines have really narrow ones so it's holding your baby on your lap the whole time, passing them back and forth, even in business!

The bassinet would definitely be a game changer to get two J seats.. If the convenience and degree of certainty is there, then for sure 2 J seats on rewards (don't know about paid)..

Trying to get bulkhead with bassinet in Y would be difficult..