This keeps the nipple full of milk, even when the bottle is held in a horizontal position, for easier upright feeding. (usa.philips.com)
In this period, you should have plenty of rest and sleep, it is desirable to sleep even in a daytime or at least just lie in a horizontal position. (infobaby.org)
The digital representation shows the three cameras stacked in a horizontal position at the top left corner of the device. (dealntech.com)