Baby on the way, but not enough room in the bed???

[SFC02d]

Hi,  so here's my story:

We have a 4 yr old and 2 yr old and they both coslept with us until about a couple of weeks ago.  I'm pregnant with #3 so we realized we wouldn't have enough room for everyone to sleep together in our kind sized bed.  We got 2 single beds and put them in the bedroom next to ours and we put them to bed there together everynight.  They love going to bed in their own room and have no problem with that. 

The problem lies when both of them wake up many many times a night.  I would like our 4 year old to stay in her own bed from now on since I think she's old enough, but i don't mind if our 2 year old still sleeps in our bed sometimes.  I don't want my 4 year old to feel like she's being isolated or alone though.  I've been bringing my 4 year old back to her bed everynight when she wakes up and she's perfectly ok with that, but sometimes she gets up 5-6 times a night!  I'm 36 weeks pregnant right now and having a hard time sleeping myself so all this extra waking up is killing me.  Also, she won't accept having my husband bring her back to her bed only me!  When my 2 year old wakes up i just comfort her back to sleep in her own bed once or twice then I just bring her into our bed because I need to get SOME sleep.

I'm just worried because when DS gets here in 3 weeks or so I'm not going to be able to get up 5 times a night to put my 4 year old back in her bed because I'll have a newborn next to me.  I tried buying a special little TInker Bell couch that opens up to a bed next to me on the floor but she refuses it.  In fact if we try anything else besides me bringing my 4 year old back to her bed she just screams.  I'm at a lost and really need help!!!  THank you!

[D_McG]

Why are they waking up?  That is a lot of waking for an older child, IMO.  Is there a possibility of a sleep disorder?

With both of mine (now 5 and almost 3) coming into our bed at night is no longer an option (I also have a baby) and they 'get' daddy at night b/c I'm dealing with the baby.   This may have caused a tantrum or two at the start but they really didn't have an option and they adjusted quickly.  They almost never wake now.  

If you are confident that it's behavioral (and there is no physical cause for the waking) then I would tell her during the day that it's daddy or nobody and weather the tantrum.  But do consider physical causes for waking.  I do not know of a 4 year old with that much waking.  Unless you're reinforcing it in some way?  Like giving her a snack every time she wakes up or something?