The answer to this question is C
I think C is the answer i am not 100% sure but i am 75% sure
Answer:
Holding the head up. Infancy is a period when the baby grows very fast. During infancy, the baby doubles in length and triples in weight. Other important changes also happen during infancy: ... The baby starts smiling, paying attention to other people, and grabbing toys.
Hi Ace22704,
Answer - natural observation
I think this experimental method is a better option because its in a natural environment where the kids dont know whats happening unlike the suveys where you ask them questions which is probably a bad idea because they might feel scared and just change their minds.
