periods of pregnancy

Hej czy mogłby mi ktoś sprawdzić moją cześć projektu o ciązy?Chce mieć pewność ,że wszystko jest poprawnie ;)

Pregnancy is typically broken into three periods, or trimesters, each of about three months.
First trimestr
For the first three months, it is difficult to see that the woman is pregnant.For the first 14 weeks the child will grow 9 cm long and will have developed all the basics organs. X-rays, drinking alkohol, smoking and use of medication during this period can seriously harm your baby.Particularly important is the diet, as both mother and child require proper nutrition.
In first month woman may find enlargement and sensitivity of breasts and the appearance of "morning sickness" and vomit.
Second trimestr
During the second trimester, which lasts from 15 to 24 weeks of pregnancy, the baby reaches a length of 30 cm, weight about 700 grams and you will see clearly whether it is a boy or a girl.
Mother will look and feel much better.Many earlier problems will cease.During this trimester woman may gain weight from 4 to 6 kilos and will feel the baby's movements.
Third trimestr
During the last 16 weeks of pregnancy, the baby is fully formed.At the beginning of this trimester is still tiny, but growing faster than ever, reaching a weight of between 3 and 4.5 kg in the 40th week of pregnancy.Now the baby's movements are getting stronger and heavier.
Mother may experience some discomfort in connection with the urge to abdomen and bladder as the baby moves in the direction of the pelvic floor. Perhaps the woman will be quicker to tire. Particularly important is proper nutrition, because in these last months, your baby is growing the most.

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Looks really great to me besides:

,,Pregnancy is typically broken into three periods''

you're sure about 'broken'? I've never seen it in such context before. Maybe it would be more obvious and understood to others if you used 'pregnancy is typically divided into three periods'?

And I'm not sure about this:
,, reaching a weight of between 3 and 4.5 kg'' - never seen it either, I'd like to get to know if it's correctly to.

Pregnancy is typically 'broken' (daj lepsze slowo) into three periods, or trimesters, each (tu cos brak) of about three months.
First 'trimestr' (blad ortog)
For the first three months, it is difficult to 'see' (daj inne slowo) that the woman is pregnant.For the first 14 weeks 'the child' (nie mozesz mowic o 'child' tutaj, nieodpwiedne slowo) will grow (brak 2 slowa) 9 cm long and will have developed all the 'basics' (zle slowo) organs. X-rays, drinking 'alkohol'(ortog), smoking and (brak cos) use of medication during this period can seriously harm 'your' (dlaczego odzywasz sie teraz jako 'you'- to nie mowisz do konkretnej osoby tylko ogolnie, trzeba bezimmiennie) baby. 'Particularly important' (ja bym to dala inaczej...Of particular impoprtance during this period) is the diet, as both mother and child require proper nutrition.
In (helloo? a gdzie przedimek?) first month (brak cos) woman may 'find' (poszukaj inne slowo) enlargement and sensitivity of breasts and the appearance of "morning sickness" (wytlumacz co to jest) and vomit.
Second 'trimestr' (ortog)
During the second trimester, which lasts from (cos brak) 15 to 24 weeks of pregnancy, the baby reaches a length of 30 cm, (cos brak) weight (cos brak) about 700 grams and 'you' (nie uzywaj 'you' tutaj piszesz cos innego, nie pomoc dla mlodych matek, bo jak tak, to trzeba to wszystko przepisac) (daj it is possible to distinguish....) 'will see clearly' (niepotr) whether it is a boy or a girl.
(a gdzie przedimek? co to?) mother will look and feel much better (than what? musisz napisac).
During this trimester (cos brak) woman may gain weight from 4 to 6 kilos and will (be able to) feel the baby's movements.
Third 'trimestr' (ortog)
At the beginning of this trimester (kto? co? musisz napisac) is still tiny, but growing faster than ever, reaching a weight of between 3 and 4.5 kg in the 40th week of pregnancy. Now the baby's movements are 'getting stronger and heavier' 9napisz to inaczej).
(cos brak) mother may experience some discomfort (tutaj daj ...in the abdomen) in connection with the urge 'to abdomen' (urge to abdomen? co ty wypisujesz?) and bladder as the baby moves in the direction of the pelvic floor. 'Perhaps' (there's no 'perhaps' about it, it is very likely) THAT the woman will be quicker to tire. 'Particularly important' (napisz to jak napisalam wyzej...Of particular...) is 'proper' (co to znaczy- napisz to fachowo, nie tak jak z ulicy) nutrition, because in these last months, 'your' (daj cos innego) baby is growing the most.