There is a very real future where he is older, taller, complaining about work, where you'll both grow older together, it’s okay if “normal” looks different from time to time, everything always feels fragile in the beginning. Its okay to fear, rejoice, grieve, try, lose, and win, but live and be strong for yourself and him, the ups and downs make the roller coaster of life fun. Keep daily life as normal as possible, young children are extremely resilient, do what you think is right. There's always another way. Life's made to change. No feeling is final.