Rectal stimuli for constipated newborn?

Lechenette • Wife. Expecting our first 🎀 1/2018.

I'm so sad my poor 6 day old is so constipated - nothing in 4 days. She is now so fussy and cries for so long it breaks my heart.

I read you can do rectal stimuli but is it safe on an infant? We don't have vascilene so would lubricant work? Help pleas e