If your baby really doesn't like being on her tummy, leave it for now and try again another time. Bear in mind that babies develop differently, some more quickly than others. If your baby isn't rolling over by the time she is six months or seven months old, talk to your GP or health visitor.
Some men stop growing at 18, some at 21. Some men grow really quickly early on, and slowly grow taller until they have hit somewhere between 18 and 21, while others grow quickly later on and some just grow gradually. So, only time can tell you, no one else can because everyone is different.
When Do Boys Stop Growing? Infants grow so fast and so often in the first year most parents accept this as the norm, but nature plays a trick on us. After the age of two, this quick rate of growth slows down substantially to a turtle-like 2.5 inches (6 cm) per year, explains Dr. Mark Gettleman, a pediatrician and the founder of Dr. Goofy Gettwell Pediatrics. This steady state of growth remains until puberty, which starts around age 10 to 15 in boys. Puberty marks the beginning of numerous bodily changes in children and starts the first of many growth spurts, which will continue through the teen years and into early adulthood.