Dear Constacia,
From the description of the events, twin #2 appears to be having the
continued episodes of turing blue.  At this point I would insist the mom have
someone recheck this baby out, the heart, and if that is normal then some
close monitoring of the suck/swallow/breathing.  In the first couple of days
of life you can contribute the mucous and the transition of the vesels
closing to transient episosodes of turning blue but not after that.
Keep us posted.
Ann Perry RN IBCLC