Re: Relactation for interested 16 month old while pregnant.
Welcome to the forum and congratulations on the baby to come!
I think that it's great that your toddler wants to nurse. I would probably let him, even if he acts silly. The practice might be all he needs to transition him to tandem nursing when your milk comes in after your new baby is born. Just be careful- if you feel a real increase in contractions when your toddler is nursing, or you have a history of miscarriage or preterm labor, it might be best to limit nursing or not nurse at all.
The reason I think you should keep it casual and silly is that relactation during pregnancy is probably not possible and is probably not a healthy choice for your current baby. First, hormones produced by the placenta govern milk supply during pregnancy, and there's no amount of pumping you could do that would bring back your milk production when those hormones are inhibiting it. Some moms maintain supply during pregnancy, but they are the exception rather than the rule. Second, pumping is definitely not something you want to do while pregnant. It can set off strong uterine contractions and can actually be used to induce labor, and that is not what you want at 25 weeks.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"