Kat - with regard to the sensor monitors - we have the tommee tippee one and it works a treat, it goes off after 20 seconds - so perhaps this would ease you mind if Ivy prefers her tummy? You can get them at Target for about $200 but we got ours for $150 when they had 25% off. (There is a $10 target voucher in the bounty bag if you go that)

Naomi