Hi, Could you recommend what type of baby carrier I should buy? Any specific brand? I'm talking about the ones you put your baby in and you carrying them on your chest looking at you or forward. Please let me know. Thanks

Slings & other baby carriers are not recommended as a long term sleep environment.
Care needs to be taken with a very young baby in a baby carrier.
Red Nose has the following information when using baby carriers.

If you choose to carry baby in a sling, at all times ensure that:

baby’s airways are free at all times
you can see baby’s face
never using products that are described as ‘womb-like’ or a ‘cocoon’.
Your baby’s back is supported in a natural position so their tummy and chest are against you.
A baby should never be curled so that their chin is forced onto their chest as this can restrict their breathing.
Babies can suffocate lying with a curved back with the chin resting on the chest or the face pressed against the fabric of the sling or the wearer’s body. At particular risk from these products are babies with a low birth weight, those that were born prematurely, or have breathing issues such as a cold.
https://rednose.org.au/article/how-do-i-carry-baby-safely-in-a-sling

Product Safety Australia also has some information
Child safety experts do not recommend carrying children younger than four months in framed carriers.
https://www.productsafety.gov.au/products/babies-kids/kids-equipment/baby-slings-carriers

Remember and follow the TICKS rules:

T — Tight: Slings should be tight enough to hug your baby close to you.
I — In view at all times: You should always be able to see your baby’s face by simply glancing down.
C — Close enough to kiss: By tipping your head forward you should be able to kiss your baby on the head.
K — Keep chin off the chest: A baby should never be curled so that their chin is forced onto their chest as this can restrict their breathing.
S — Supported back: The baby’s back should be supported in a natural position so their tummy and chest are against you.

https://www.productsafety.gov.au/news/baby-sling-safety
https://www.productsafety.gov.au/system/files/Baby slings - Fact sheet_0.pdf