Just as I suspected was coming. She had the placenta to push out so she could begin laboring and delivery of her babies, as her body was changing from basically pre-labor, which caused the placenta to come out first.thank you everyone
she went into labor 4 hours ago and gave birth to 2 kittens with their placentas
since then she seems fine nursing and calm
am not sure yet if there are still kitten to come or not
kitten look fine suckling the nipples but a little bit weak and slow
I tend to beleive the first placenta was for an absorbed kitten
how can I be sure that she has no kitten or placentas left inside her and that she is done?
and how do I know if the babies are nursing correctly and are getting enough milk or not ?
You can keep an eye on her watching for any distress but she is likely done.
As far as whether or not the babies are nursing well enough, they likely are, brand newborn babies are small and won't always have the suction power that comes in another week, or even days, the key is to be sure there is interest and eagerness to nurse rather than snuggling with mom, sucking for a minute or so and then sleeping. They should be more eager than that.
Weighing as mentioned by @StefanZ
is the best way to determine how they are doing, weighing daily with an ounce/gram scale that is accurate. They need to gain every single day without fail, except the first day as they often lose a bit.
Congrats! Glad things seem well, if you can post a pic of mom with babies that would be nice to see