The answer is...
...my baby's every single movement!
I'm so in love with my baby's active "training sessions" in my belly every single day! :D
The article below shows the different types of fetal movement during pregnancy.
[Credit: Article source]
Flutters & Tapping
In as early as 16 weeks, your baby's constant movements might now become apparent to you. These early movements have been categorized as a "flutter" or "tapping," very similar to a muscle spasm or gas bubble you may have experiences before. Quite appropriately, these little flutters can often give you the butterflies. These feelings are also sometimes called quickening.
Me: I felt my baby's very first movement during the 17th week.
Kicking & Punching
As your baby gets stronger and slightly bigger, you may begin to feel some jabs and kicks. You can get a sense of how big your baby is when you feel a kick close to your belly button and feel its reverse reaction on the lower part of your pelvic bone. Although your belly is growing to accommodate your baby, he or she will start to be a little crammed sooner or later, and these kicks and punches can become more violent and sometimes even jolting enough to take your breath away or stop you in your tracks. They should never cause serious pain, but you might begin feeling a little discomfort closer to your due date. Regardless, it's all a reminder of how amazing pregnancy can be, and how much your little one grows each day.
Me: My baby started kicking during the 21st week and the rhythm has gotten stronger as weeks went by.
Rolling & Sliding
You usually don't hear "is he rolling?" more than "is he kicking?" but it happens just as much. This feels much like an inside out Shiatsu massage chair in your belly. You may feel like your baby is a little squirmy snake or wiggly fish. This is a really fun part of fetal movement because you can actually see your baby moving inside your belly. And where your husband, other children, friends and other family members can't feel the baby like you do, they can see him move when he changes positions. It may become something you share as a couple and/or family before the baby's arrival. It's a way for everyone to bond with the baby and each other before birth.
Me: Yes, this is fun! How I love watching my belly moves on its own as if a little alien is hiding behind it! :P
Tickles & Popping
It might sound crazy, but it is quite possible that your baby is blowing bubbles in the womb. Although their lungs are full of fluid, they prepare their lungs for birth by expelling these fluids into the amniotic sac, which feels very similar to a bubbling tickle in the womb. Some mothers even report being able to see their baby blow bubbles during an ultrasound. Your baby may also have the ability to pop these bubbles, or even "cry", causing the same sensation.
Me: This, I haven't felt yet.
Vibrations & Spasms
Sometimes scary and unexpected, but these feelings are completely normal. These can most likely be attributed to fetal hiccups. Fetal hiccups are unlike regular hiccups, but they have the same spontaneous reaction. It is normal to experience these occurrences multiple times a day, and even normal to never feel them at all. It all depends on the baby - every pregnancy is different. For mothers, fetal hiccups can feel like their belly is experiencing a rhythmic earthquake with shakes and shocking spastic movements. The baby can even be a little frustrated and disturbed by these hiccups, thus thrusting and stretching around inside, causing even more chaos in the womb.
Me: Yeah, sometimes I do feel mini earthquakes or tsunami ripples in my belly. I will rub my belly gently to soothe my baby.
