Mel,

Charlie's placenta was anterior and I felt less kicks. (olivia's had been posterior) But my OB here in Adelaide & his midwives used a doppler on me for each visit (after about 5 months) and I could always hear the HB as clear as anything (even through my "maternal padding", LOL!)

The other thing to bear in mind, as frustrating as it is, is that I found I felt less kicks/movement anyway, because I was less focused on myself and more running round with Olivia.....so you may find you miss out of seeling all the movements anyways, becasue of focussing of Jacob? (Sad but true with subsequent pregnancies I think?) Dunno.........