When did you feel movement with baby #2+

Jenni • Married. 1st son is almost 2, pregnant with baby #2 due June 11th
I think I've felt flutters more recently (I'm 16w4d) but I continued to feel flutters after delivering my son so now I don't know if it's baby flutters or imaginary ones that I had before. 
My question is when were you able to feel pronounced movement that you could be sure was baby when you were pregnant with your second or more child?