OMG - I am hopeless

I can't believed myself. I miscalculated my babies age. I kept thinking that they are 18 months when in fact, they are only 17 months. How can i possible made such a mistake? I have to literally sat in front of the calendar to count the months. I felt so useless. What kind of mother does that make me? This Sunday, I will have to send them early to my nanny place to go for a corporate golf game at Sentosa. I am really not keen in playing but I need to. I will make up to them for the lost time. I am planning a staycation with the Twins at RWS. This will be our first getaway with the babies. We need to try locate to explore dealing with them. I think it will be fun and counting down to that. Happy holidaying with my tiwns.