Please take a breathe. Then listen to what I'm going to say with an open heart and mind. I have a lot of years working with kids as a nanny and as a child care facility worker and owner.
Your child is behind according to what you've stated. Okay? That's NOT the end of the world or bad parenting or anything you've likely done.
1. Some kids don't walk until they're older. My ex-brother in law didn't walk until he was 3. He got a new doc and that doc took one look at his legs and noticed he had a deformity. He was so bowlegged he couldn't put weight on his ankles. The other doc just thought he was okay. Older country doc verses city doc with a degree in pediatrics.
There are many things that can keep a child from walking and not all of them are physical. Sometimes they just don't want to walk. An evaluation by an experienced team in a facility that does this sort of work every day is where you need to take this baby.
2. Not being able to hold her own bottle is concerning. Laying on her back only and having issues all round with that area is something that a doctor should be addressing. Sitting up in a high chair with tiny tiny bits of food on the tray should encourage her to take bites. If she's not interested in that then she does need that evaluation sooner rather than later.
3. I have no concerns about her language skills. She is okay with what she's doing. The other things going on can influence what she is able to do. Perhaps she has a throat issue that prohibits her from drinking normally and it's effecting her ability to speak? Or it could be that she just isn't ready.
Give speech another 6-9 months as long as that is part of the process of evaluations to make sure there aren't any physical issues they want to address.
4. How is she feeling new surfaces if she has shoes on? She should be wearing good supportive shoes so her ankles will be straight and strong while trying to support her weight. That should help with her "feeling" new surfaces with her feet.
5. I don't know how to say this without it possibly making you feel bad and that is certainly not not not not not my intention.
S., please know that your child has some issues that may or may not be cognitive or physical but a disability of some sort. You did not fail her, you did not wait too long to try and work with her on anything. Okay? You have a child that shows some signs that could be a disability.
Please don't freak out over that okay? There are many medical interventions, training, therapies, medications, etc....that can really really help teach you how to effectively bring your child up to their maximum ability.
Parents have a big job ahead of them in every way. Kids with issues are very very very able to achieve much and have a happy fulfilling life.
Just take it a day at a time and research your area and get a thorough evaluation done for physical, mental, cognitive levels so you know where to start and what is what. That way you know where you are and what is fact and what is fiction. This will help you have strength.