I'm very sorry for your families loss i have 3 living children as well and it has been hard on them too,each of them dealt/dealing with the loss differently.My son was 3 when we had our loss and he seemed/seem to get comfort from drawing pictures and putting them in Matthew's memory box also he blows kisses to his burial pot,maybe your children could blow kisses to heaven instead of your belly.It is so hard for them ,I tried to keep up with their normal activities such as dancing ,gymnastics and when they saw /see me crying told them i was sad about losing Matthew,but happy i didn't lose them.